How to Convert a Float to an Integer in Pandas DataFrame
We will demonstrate methods to convert a float to an integer in a Pandas DataFrame - astype(int) and to_numeric() methods.
First, we create a random array using the NumPy library and then convert it into DataFrame.
pythonCopyimport pandas as pd
import numpy as np
df = pd.DataFrame(np.random.rand(5, 5) * 5)
print(df)
If you run this code, you will get the output as following which has values of float type.
textCopy0 1 2 3 4
00.3024483.5519583.8786602.3803524.741592
14.0541870.9409520.4590584.3148010.524993
22.8917334.9268854.9557732.6263734.144166
31.1276393.1968234.1440201.3506320.401138
41.4235372.0194553.0389450.4366573.823888
astype(int) to Convert float to int in Pandas
To convert float into int we could use the Pandas DataFrame.astype(int) method. The code is,
pythonCopyimport pandas as pd
import numpy as np
df = pd.DataFrame(np.random.rand(5, 5) * 5)
print("*********** Random Float DataFrame ************")
print(df)
print("***********************************************")
print("***********************************************")
print("*********** Dataframe Converted into INT ************")
print(df.astype(int))
print("***********************************************")
print("***********************************************")
After running the above codes, we will get the following output.
blankCopy*********** Random Float DataFrame ************
0 1 2 3 4
0 3.629665 2.552326 3.995622 3.155777 4.715785
1 1.597920 2.090324 0.511498 1.936061 1.286486
2 1.051634 3.550839 2.468125 4.213684 2.329477
3 3.443836 2.749433 1.560226 3.037708 2.966934
4 4.686530 2.096314 4.028526 4.253299 1.175233
***********************************************
***********************************************
*********** Dataframe Converted into INT ************
0 1 2 3 4
0 3 2 3 3 4
1 1 2 0 1 1
2 1 3 2 4 2
3 3 2 1 3 2
4 4 2 4 4 1
***********************************************
***********************************************
It converts all the Pandas DataFrame columns to int.
Convert Pandas DataFrame Column to int With Rounding Off
We can round off the float value to int by using df.round(0).astype(int).
pythonCopyimport pandas as pd
import numpy as np
df = pd.DataFrame(np.random.rand(5, 5) * 5)
print("*********** Random Float DataFrame ************")
print(df)
print("***********************************************")
print("***********************************************")
print("*********** Dataframe Converted into INT ************")
print(df.astype(int))
print("***********************************************")
print("***********************************************")
print("*********** Rounding Float value to INT ************")
print(df.round(0).astype(int))
print("***********************************************")
print("***********************************************")
After running the codes, we will get the following output.
blankCopy*********** Random Float DataFrame ************
0 1 2 3 4
0 4.888469 3.815177 3.993451 0.901108 1.958223
1 1.009212 1.532287 2.689159 1.008482 1.394623
2 4.152496 0.265261 4.667446 4.412533 4.797394
3 0.039770 1.526753 3.778224 0.073072 0.509409
4 1.292580 3.581438 0.759043 3.872206 2.591886
***********************************************
***********************************************
*********** Dataframe Converted into INT ************
0 1 2 3 4
0 4 3 3 0 1
1 1 1 2 1 1
2 4 0 4 4 4
3 0 1 3 0 0
4 1 3 0 3 2
***********************************************
***********************************************
*********** Rounding Float value to INT ************
0 1 2 3 4
0 5 4 4 1 2
1 1 2 3 1 1
2 4 0 5 4 5
3 0 2 4 0 1
4 1 4 1 4 3
***********************************************
***********************************************
The df.astype(int) converts Pandas float to int by negelecting all the floating point digits.
df.round(0).astype(int) rounds the Pandas float number closer to zero.
to_numeric() Method to Convert float to int in Pandas
This method provides functionality to safely convert non-numeric types (e.g. strings) to a suitable numeric type.
pythonCopys = pd.Series(["1.0", "2", -3])
print(pd.to_numeric(s, downcast="integer"))
After running the codes, we will get the following output.
textCopy01
12
2 -3
dtype: int8