305 lines
11 KiB
Python
305 lines
11 KiB
Python
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# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2025)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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import types
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from pathlib import Path
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from typing import Callable
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from streamlit.errors import StreamlitAPIException
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from streamlit.runtime.metrics_util import gather_metrics
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from streamlit.runtime.scriptrunner_utils.script_run_context import get_script_run_ctx
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from streamlit.source_util import page_icon_and_name
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from streamlit.string_util import validate_icon_or_emoji
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from streamlit.util import calc_md5
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@gather_metrics("Page")
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def Page( # noqa: N802
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page: str | Path | Callable[[], None],
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*,
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title: str | None = None,
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icon: str | None = None,
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url_path: str | None = None,
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default: bool = False,
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) -> StreamlitPage:
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"""Configure a page for ``st.navigation`` in a multipage app.
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Call ``st.Page`` to initialize a ``StreamlitPage`` object, and pass it to
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``st.navigation`` to declare a page in your app.
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When a user navigates to a page, ``st.navigation`` returns the selected
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``StreamlitPage`` object. Call ``.run()`` on the returned ``StreamlitPage``
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object to execute the page. You can only run the page returned by
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``st.navigation``, and you can only run it once per app rerun.
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A page can be defined by a Python file or ``Callable``.
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Parameters
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----------
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page : str, Path, or callable
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The page source as a ``Callable`` or path to a Python file. If the page
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source is defined by a Python file, the path can be a string or
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``pathlib.Path`` object. Paths can be absolute or relative to the
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entrypoint file. If the page source is defined by a ``Callable``, the
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``Callable`` can't accept arguments.
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title : str or None
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The title of the page. If this is ``None`` (default), the page title
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(in the browser tab) and label (in the navigation menu) will be
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inferred from the filename or callable name in ``page``. For more
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information, see `Overview of multipage apps
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<https://docs.streamlit.io/st.page.automatic-page-labels>`_.
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icon : str or None
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An optional emoji or icon to display next to the page title and label.
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If ``icon`` is ``None`` (default), no icon is displayed next to the
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page label in the navigation menu, and a Streamlit icon is displayed
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next to the title (in the browser tab). If ``icon`` is a string, the
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following options are valid:
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- A single-character emoji. For example, you can set ``icon="🚨"``
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or ``icon="🔥"``. Emoji short codes are not supported.
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- An icon from the Material Symbols library (rounded style) in the
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format ``":material/icon_name:"`` where "icon_name" is the name
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of the icon in snake case.
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For example, ``icon=":material/thumb_up:"`` will display the
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Thumb Up icon. Find additional icons in the `Material Symbols \
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<https://fonts.google.com/icons?icon.set=Material+Symbols&icon.style=Rounded>`_
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font library.
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url_path : str or None
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The page's URL pathname, which is the path relative to the app's root
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URL. If this is ``None`` (default), the URL pathname will be inferred
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from the filename or callable name in ``page``. For more information,
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see `Overview of multipage apps
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<https://docs.streamlit.io/st.page.automatic-page-urls>`_.
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The default page will have a pathname of ``""``, indicating the root
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URL of the app. If you set ``default=True``, ``url_path`` is ignored.
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``url_path`` can't include forward slashes; paths can't include
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subdirectories.
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default : bool
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Whether this page is the default page to be shown when the app is
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loaded. If ``default`` is ``False`` (default), the page will have a
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nonempty URL pathname. However, if no default page is passed to
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``st.navigation`` and this is the first page, this page will become the
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default page. If ``default`` is ``True``, then the page will have
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an empty pathname and ``url_path`` will be ignored.
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Returns
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-------
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StreamlitPage
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The page object associated to the given script.
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Example
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-------
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>>> import streamlit as st
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>>>
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>>> def page2():
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>>> st.title("Second page")
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>>>
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>>> pg = st.navigation([
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>>> st.Page("page1.py", title="First page", icon="🔥"),
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>>> st.Page(page2, title="Second page", icon=":material/favorite:"),
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>>> ])
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>>> pg.run()
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"""
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return StreamlitPage(
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page, title=title, icon=icon, url_path=url_path, default=default
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)
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class StreamlitPage:
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"""A page within a multipage Streamlit app.
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Use ``st.Page`` to initialize a ``StreamlitPage`` object.
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Attributes
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----------
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icon : str
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The icon of the page.
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If no icon was declared in ``st.Page``, this property returns ``""``.
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title : str
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The title of the page.
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Unless declared otherwise in ``st.Page``, the page title is inferred
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from the filename or callable name. For more information, see
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`Overview of multipage apps
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<https://docs.streamlit.io/st.page.automatic-page-labels>`_.
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url_path : str
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The page's URL pathname, which is the path relative to the app's root
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URL.
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Unless declared otherwise in ``st.Page``, the URL pathname is inferred
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from the filename or callable name. For more information, see
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`Overview of multipage apps
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<https://docs.streamlit.io/st.page.automatic-page-urls>`_.
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The default page will always have a ``url_path`` of ``""`` to indicate
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the root URL (e.g. homepage).
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"""
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def __init__(
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self,
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page: str | Path | Callable[[], None],
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*,
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title: str | None = None,
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icon: str | None = None,
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url_path: str | None = None,
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default: bool = False,
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) -> None:
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# Must appear before the return so all pages, even if running in bare Python,
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# have a _default property. This way we can always tell which script needs to run.
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self._default: bool = default
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ctx = get_script_run_ctx()
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if not ctx:
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return
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main_path = ctx.pages_manager.main_script_parent
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if isinstance(page, str):
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page = Path(page)
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if isinstance(page, Path):
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page = (main_path / page).resolve()
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if not page.is_file():
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raise StreamlitAPIException(
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f"Unable to create Page. The file `{page.name}` could not be found."
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)
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inferred_name = ""
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inferred_icon = ""
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if isinstance(page, Path):
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inferred_icon, inferred_name = page_icon_and_name(page)
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elif hasattr(page, "__name__"):
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inferred_name = str(page.__name__)
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elif title is None:
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# At this point, we know the page is not a string or a path, so it
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# must be a callable. We expect it to have a __name__ attribute,
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# but in special cases (e.g. a callable class instance), one may
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# not exist. In that case, we should inform the user the title is
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# mandatory.
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raise StreamlitAPIException(
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"Cannot infer page title for Callable. Set the `title=` keyword argument."
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)
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self._page: Path | Callable[[], None] = page
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self._title: str = title or inferred_name.replace("_", " ")
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if icon is not None:
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# validate user provided icon.
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validate_icon_or_emoji(icon)
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self._icon: str = icon or inferred_icon
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if self._title.strip() == "":
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raise StreamlitAPIException(
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"The title of the page cannot be empty or consist of underscores/spaces only"
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)
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self._url_path: str = inferred_name
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if url_path is not None:
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if url_path.strip() == "" and not default:
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raise StreamlitAPIException(
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"The URL path cannot be an empty string unless the page is the default page."
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)
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self._url_path = url_path.strip("/")
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if "/" in self._url_path:
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raise StreamlitAPIException(
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"The URL path cannot contain a nested path (e.g. foo/bar)."
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)
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if self._icon:
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validate_icon_or_emoji(self._icon)
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# used by st.navigation to ordain a page as runnable
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self._can_be_called: bool = False
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@property
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def title(self) -> str:
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"""The title of the page.
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Unless declared otherwise in ``st.Page``, the page title is inferred
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from the filename or callable name. For more information, see
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`Overview of multipage apps
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<https://docs.streamlit.io/st.page.automatic-page-labels>`_.
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"""
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return self._title
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@property
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def icon(self) -> str:
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"""The icon of the page.
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If no icon was declared in ``st.Page``, this property returns ``""``.
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"""
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return self._icon
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@property
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def url_path(self) -> str:
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"""The page's URL pathname, which is the path relative to the app's \
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root URL.
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Unless declared otherwise in ``st.Page``, the URL pathname is inferred
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from the filename or callable name. For more information, see
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`Overview of multipage apps
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<https://docs.streamlit.io/st.page.automatic-page-urls>`_.
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The default page will always have a ``url_path`` of ``""`` to indicate
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the root URL (e.g. homepage).
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"""
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return "" if self._default else self._url_path
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def run(self) -> None:
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"""Execute the page.
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When a page is returned by ``st.navigation``, use the ``.run()`` method
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within your entrypoint file to render the page. You can only call this
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method on the page returned by ``st.navigation``. You can only call
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this method once per run of your entrypoint file.
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"""
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if not self._can_be_called:
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raise StreamlitAPIException(
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"This page cannot be called directly. Only the page returned from st.navigation can be called once."
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)
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self._can_be_called = False
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ctx = get_script_run_ctx()
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if not ctx:
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return
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with ctx.run_with_active_hash(self._script_hash):
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if callable(self._page):
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self._page()
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return
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code = ctx.pages_manager.get_page_script_byte_code(str(self._page))
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module = types.ModuleType("__main__")
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# We want __file__ to be the string path to the script
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module.__dict__["__file__"] = str(self._page)
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exec(code, module.__dict__) # noqa: S102
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@property
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def _script_hash(self) -> str:
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return calc_md5(self._url_path)
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