Αποτελέσματα Αναζήτησης
1. Use pd.Index to name an index (or column) from construction. Pandas has Index (MultiIndex) objects that accepts names. Passing those as index or column on dataframe construction constructs frames with named indices/columns.
Indexing and selecting data. #. The axis labeling information in pandas objects serves many purposes: Identifies data (i.e. provides metadata) using known indicators, important for analysis, visualization, and interactive console display. Enables automatic and explicit data alignment.
You can also construct a MultiIndex from a DataFrame directly, using the method MultiIndex.from_frame(). This is a complementary method to MultiIndex.to_frame(). In [10]: df = pd.DataFrame( ....: [["bar", "one"], ["bar", "two"], ["foo", "one"], ["foo", "two"]], ....: columns=["first", "second"], ....:
Set the DataFrame index (row labels) using one or more existing columns or arrays (of the correct length). The index can replace the existing index or expand on it. Parameters: keyslabel or array-like or list of labels/arrays.
31 Ιουλ 2024 · Indexing and selecting data with pandas involve specifying which data points (rows and columns) in a DataFrame or Series you want to access or modify. Pandas provides powerful tools for selecting data based on label indexing, integer indexing, or condition-based filtering.
8 Αυγ 2023 · You can select and get rows, columns, and elements in pandas.DataFrame and pandas.Series by index (numbers and names) using [] (square brackets). Contents. Select columns by column numbers/names using [] [Column name]: Get a single column as pandas.Series. [List of column names]: Get single or multiple columns as pandas.DataFrame. loc and iloc.
21 Αυγ 2019 · To set an existing column as index, use set_index(<colname>, verify_integrity=True): import pandas as pd df = pd.DataFrame({ 'name':['john','mary','peter','nancy','gary'], 'age':[22,33,27,22,31], 'state':['AK','DC','CA','CA','NY'] }) df.set_index('name', verify_integrity=True) BEFORE: using default. numerical index.
