In Python Pandas multiple rows of data are selected according to the values of columns
- 2021-07-10 20:26:06
- OfStack
Selecting Multiple Rows of Data Based on Column Values in Pandas
# Select a row record equal to some value Use ==
df.loc[df['column_name'] == some_value]
# Select whether a column is a 1 Numeric value of type Use isin
df.loc[df['column_name'].isin(some_values)]
# Selection of various conditions Use &
df.loc[(df['column'] == some_value) & df['other_column'].isin(some_values)]
# Select row records that are not equal to certain values Use ! =
df.loc[df['column_name'] != some_value]
# isin Return 1 Numerical value of series , If you want to select a value that does not meet this condition, use the ~
df.loc[~df['column_name'].isin(some_values)]
import pandas as pd
import numpy as np
df = pd.DataFrame({'A': 'foo bar foo bar foo bar foo foo'.split(),
'B': 'one one two three two two one three'.split(),
'C': np.arange(8), 'D': np.arange(8) * 2})
print(df)
A B C D
0 foo one 0 0
1 bar one 1 2
2 foo two 2 4
3 bar three 3 6
4 foo two 4 8
5 bar two 5 10
6 foo one 6 12
7 foo three 7 14
print(df.loc[df['A'] == 'foo'])
A B C D
0 foo one 0 0
2 foo two 2 4
4 foo two 4 8
6 foo one 6 12
7 foo three 7 14
# If you want to include multiple values, put them in the 1 A list Inside, and then use isin
print(df.loc[df['B'].isin(['one','three'])])
A B C D
0 foo one 0 0
1 bar one 1 2
3 bar three 3 6
6 foo one 6 12
7 foo three 7 14
df = df.set_index(['B'])
print(df.loc['one'])
A B C D
one foo 0 0
one bar 1 2
one foo 6 12
A B C D
one foo 0 0
one bar 1 2
two foo 2 4
two foo 4 8
two bar 5 10
one foo 6 12
Summarize