How to delete DataFrame data in Pandas

Today, I will talk to you about how to delete DataFrame data in Pandas. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Next, we introduce the deletion of DataFrame data in Pandas, mainly using drop and del methods.

The argument of # drop function explains drop (self, labels=None, # is the label of the row and column to be deleted, given in the list; axis=0, # axis refers to which axis, 0 is the row (default) and 1 is the column Index=None, # index refers to a row or rows of columns=None, # columns refers to a column or columns of level=None, # level refers to a level, for the case of multiple indexes; inplace=False, whether # inplaces replaces the original dataframe; errors= "raise",) axis=0 or rows specified by index or columns only need to use a set of 1. Based on the default row-column index operation

Sample data

Import numpy as npimport pandas as pd# generates a random array-5 rows and 5 columns df = pd.DataFrame (np.random.rand (5)) print (df)

Data presentation

0 12 3 40 0.760489 0.074633 0.788416 0.087612 0.5605391 0.758450 0.599777 0.384075 0.525483 0.6289102 0.386808 0.148106 0.742207 0.452627 0.7759633 0.662909 0.134640 0.186186 0.735429 0.4595564 0.328694 0.269088 0.331404 0.835388 0.8991071.1 row deletion

[1] Delete a single line

# Delete a single line, delete line 2 df.drop (df.index [1], inplace=True) # inplace=True modify print (df)

Execution result:

0 1 2 3 4

0 0.605764 0.234973 0.566346 0.598105 0.478153

2 0.383230 0.822174 0.228855 0.743258 0.076701

3 0.875287 0.576668 0.176982 0.341827 0.112582

4 0.205425 0.898544 0.799174 0.000905 0.377990

[2] Delete discontiguous lines

# Delete discontiguous lines, delete lines 2 and 4 df.drop (df.index [[1d3]], inplace=True) print (df)

Execution result:

0 1 2 3 4

0 0.978612 0.556539 0.781362 0.547527 0.706686

2 0.845822 0.321716 0.444176 0.053915 0.296631

4 0.617735 0.040859 0.129235 0.525116 0.005357

[3] Delete consecutive lines

# Delete consecutive multiline df.drop (df.index [1:3], inplace=True) # open range, and the last index number is not counted as print (df)

Execution result:

0 1 2 3 4

0 0.072891 0.926297 0.882265 0.971368 0.567840

3 0.163212 0.546069 0.360990 0.494274 0.065744

4 0.752917 0.242112 0.526675 0.918713 0.320725

1.2 column deletion

Del and drop can be used to delete the column. Del df [1] # deletes the second column, which is deleted in place. This article specifically explains the deletion of the drop function.

[1] Delete the specified column

Df.drop ([1p3], axis=1,inplace=True) # specify the axis as the column # df.drop (columns= [1p3], inplace=True) # specify the column directly

Execution result:

0 2 4

0 0.592869 0.123369 0.815126

1 0.127064 0.093994 0.332790

2 0.411560 0.118753 0.143854

3 0.965317 0.267740 0.349927

4 0.688604 0.699658 0.932645

[2] Delete consecutive columns

Df.drop (df.columns [1:3], axis=1,inplace=True) # specify axis # df.drop (columns=df.columns [1:3], inplace=True) # specify column print (df)

Execution result:

0 3 4

0 0.309674 0.974694 0.660285

1 0.677328 0.969440 0.953452

2 0.954114 0.953569 0.959771

3 0.365643 0.417065 0.951372

4 0.733081 0.880914 0.804032

two。 According to the custom row and column index operation

Sample data

Df = pd.DataFrame (data=np.random.rand (5)) df.index = list ('abcde') df.columns = list (' one two three four five') print (df)

Data presentation

One two three four five a 0.188495 0.574422 0.530326 0.842489 0.474946b 0.912522 0.982093 0.964031 0.498638 0.826693c 0.580789 0.013957 0.515229 0.795052 0.859267d 0.559267d 0.565602 0.305256 0.552566 0.754791e 0.375407 0.236118 0.129210 0.711744 0.0673562.1 row deletion

[1] Delete a single line

Df.drop (['b'], inplace=True) print (df)

Execution result:

One, two, three, four, five.

A 0.306350 0.622067 0.030573 0.490563 0.009987

C 0.672423 0.071661 0.274529 0.400086 0.263024

D 0.654204 0.809087 0.066099 0.167290 0.534452

E 0.628917 0.232629 0.070167 0.469962 0.957898

[2] Delete multiple lines

Df.drop (['baked Magazine], inplace=True) print (df)

Execution result:

One, two, three, four, five.

A 0.391583 0.509862 0.924634 0.466563 0.058414

C 0.802016 0.621347 0.659215 0.575728 0.935811

E 0.223372 0.286116 0.130587 0.113544 0.910859

2.2 column deletion

[1] Delete a single column

Df.drop (['II'], axis=1,inplace=True) # Delete single column print (df)

Execution result:

One, three, four, five.

A 0.276147 0.797404 0.184472 0.081162

B 0.630190 0.328055 0.428668 0.168491

C 0.979958 0.029032 0.934626 0.106805

D 0.762995 0.003134 0.136252 0.317423

E 0.137211 0.116607 0.367742 0.840080

[2] Delete multiple columns

Df.drop (['2','4'], axis=1,inplace=True) # Delete multi-column # df.drop (columns= ['2','4'], inplace=True) # delete multi-column print (df)

Execution result:

One, three, five.

A 0.665647 0.709243 0.019711

B 0.920729 0.995913 0.490998

C 0.352816 0.185802 0.406174

D 0.136414 0.563546 0.762806

E 0.259710 0.775422 0.794880

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