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chevron_leftRow and Column Operations Cookbook
Adding a column that contains the difference in consecutive rowsAdding a constant number to DataFrame columnsAdding an empty column to a DataFrameAdding column to DataFrame with constant valuesAdding new columns to a DataFrameAppending rows to a DataFrameApplying a function that takes as input multiple column valuesApplying a function to a single column of a DataFrameChanging column type to categoricalChanging the name of a DataFrame's indexChanging the order of columns in a DataFrameChanging the type of a DataFrame's indexChanging the type of a DataFrame's columnChecking if a column exists in a DataFrameChecking if a DataFrame column contains some valuesChecking if a value exists in a DataFrame in PandasChecking if column is numericChecking the data type of columnsChecking whether column values match or contain a patternCombining two columns as a single column of tuplesCombining two columns of type string in a DataFrameComputing the average of columnsComputing the correlation between columnsConcatenating DataFrames horizontallyConcatenating DataFrames verticallyConverting a row to column labelsConverting categorical type to intConverting column to listConverting Index to listConverting percent strings into numericConverting the index of a DataFrame into a columnCounting duplicate rowsCounting number of rows with no missing valuesCounting the occurrence of values in columnsCounting unique values in a column of a DataFrameCounting unique values in rows of a DataFrameCreating a new column based on other columnsCreating new column using if, elif and elseDescribing certain columnsDropping columns whose label contains a substringGetting column values based on another column values in a DataFrame in PandasGetting columns as a copyGetting columns whose label contains a substringGetting maximum value in columnsGetting maximum value of entire DataFrameGetting mean of columnsGetting median of columnsGetting minimum value in columnsGetting row label when calling applyGetting row labels as listGetting rows where column value contains any substring in a listGetting the name of indexGetting type of indexGrouping DataFrame rows into listsInserting column at a specific locationIterating over each column of a DataFrameIterating over each row of a DataFrameModifying rows of a DataFrameModifying values in IndexRemoving columns from a DataFrameRemoving columns using column labelsRemoving columns using integer indexRemoving columns with all missing valuesRemoving columns with some missing valuesRemoving duplicate columnsRemoving duplicate rowsRemoving first n rows of a DataFrameRemoving multiple columnsRemoving prefix from column labelsRemoving rows at random without shufflingRemoving rows from a DataFrame based on column valuesRemoving rows using integer indexRemoving rows with all zerosRemoving suffix from column labelsRenaming columns of a DataFrameReplacing substring in column valuesReturning multiple columns using the apply functionReversing the order of rowsSetting a new index of a DataFrameSetting an existing column as the new indexSetting column as the indexSetting integers as column labelsShowing all column labelsShuffling the rows of a DataFrameSorting a DataFrame by columnSorting a DataFrame by indexSorting DataFrame alphabeticallySorting DataFrame by column labelsSplitting a column of strings into multiple columnsSplitting column of lists into multiple columnsSplitting dictionary into separate columnsStripping substrings from values in columnsStripping whitespace from columnsStripping whitespaces in column labelsSumming a column of a DataFrameSumming rows of specific columnsSwapping the rows and columns of a DataFrameUnstacking certain columns onlyUpdating a row while iterating over the rows of a DataFrameUpdating rows based on column valuesUsing apply method in parallel
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Checking if a value exists in a DataFrame in Pandas

schedule Aug 12, 2023
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Checking if a value exists in a DataFrame

Consider the following DataFrame:

import pandas as pd
df = pd.DataFrame({"A":[1,2,3],"B":[4,5,6]})
A B
0 1 4
1 2 5
2 3 6

To check if a value exists in the DataFrame, use the built-in in operator against the DataFrame's values property:

2 in df.values
5 in df.values
10 in df.values
True
True
False

Here:

  • the values property returns a NumPy array holding all the values in the DataFrame.

  • we are checking if the value 2, 5, 10 exists in the DataFrame.

Checking if a value exists in a certain column in the DataFrame

Consider the following DataFrame:

df = pd.DataFrame({"C":[7,8,9],"D":[10,11,12]})
df
C D
0 7 10
1 8 11
2 9 12

Solution

To check if a DataFrame column contains some values in Pandas:

df["C"].isin([8,11]).any()
True

Here, we’re checking if column C contains either the value 8 or 11.

Explanation

We first fetch column C as a Series using df["C"], and then we use isin(~) to obtain a boolean mask where True represents the presence of a value in the given list:

df["C"].isin([8,11]) # returns a Series of booleans
0 False
1 True
2 False
Name: C, dtype: bool

Here, we get True for row 1 since it holds the value 8.

Finally, we use the Series’ any() method that returns True if there is at least one True in the Series:

df["C"].isin([8,11]).any()
True
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Published by Isshin Inada
Edited by 0 others
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