How to Fix ValueError: Cannot Convert Float NaN to Integer in Python

1. Use the fillna() Method to Fix ValueError: cannot convert float NaN to integer in Python
2. Use the dropna() Method to Fix ValueError: cannot convert float NaN to integer in Python
3. Use the numpy.nan_to_num() Function to Fix ValueError: cannot convert float NaN to integer in Python

The ValueError is raised when you give a valid argument to a function, but it is an invalid value. For example, you will get the ValueError when you provide a negative number to the sqrt() function of a math module.

In Python, NaN means Not a Number, which indicates the missing entries in the dataset. It is a special float value that cannot be converted to other types than float.

The ValueError: cannot convert float NaN to integer occurs when you try to convert a NaN value to an integer type.

This tutorial will teach you to fix ValueError: cannot convert float NaN to integer in Python.

Use the fillna() Method to Fix ValueError: cannot convert float NaN to integer in Python

We have used the following dataset to convert the price data to an integer type.

Here is an example of ValueError: cannot convert float NaN to integer in Python.

# import pandas
import pandas

# read csv file
df = pandas.read_csv("itemprice.csv")
# convert to an integer type
df["price"] = df["price"].astype(int)

Output:

pandas.errors.IntCastingNaNError: Cannot convert non-finite values (NA or inf) to integer

There are two NaN values in the dataset. You can solve this problem by replacing the NaN values with 0.

The fillna() method replaces the NaN values with a given value in Python. It checks NaN values in the column and fills them with a specified value.

df_new = df.fillna(0)
print(df_new)

Output:

  items  price
0     A  540.0
1     B  370.0
2     C    0.0
3     D  220.0
4     E    0.0

Now, convert the float type to an integer type.

df_new["price"] = df_new["price"].astype(int)

Check the data type to verify.

print(df_new["price"].dtype)

Output:

int32

Use the dropna() Method to Fix ValueError: cannot convert float NaN to integer in Python

The dropna() method removes all NULL values in the DataFrame object.

The following example removes the rows that contain NULL values in the dataset.

df_new = df.dropna()
print(df_new)

Output:

  items  price
0     A  540.0
1     B  370.0
3     D  220.0

Now, you can easily convert the data to an integer type.

df_new["price"] = df_new["price"].astype(int)
print(df_new["price"].dtype)

Output:

int32

Use the numpy.nan_to_num() Function to Fix ValueError: cannot convert float NaN to integer in Python

You can also solve this error using the numpy.nan_to_num() function. It changes the NaN value to 0.0, which can be converted to an integer.

import numpy

dt = numpy.nan
print(dt)

Output:

nan

Use the numpy.nan_to_num() function to replace the NaN value with 0.0.

dt = numpy.nan_to_num(dt)
print(dt)

Output:

0.0

Then convert it to an integer type.

dt = dt.astype(int)
print(dt.dtype)

Output:

int32

The ValueError: cannot convert float NaN to integer is raised when you try to convert a NaN value to an integer type. You can fix this problem by filling the NaN values with a specified value or dropping the rows containing NaN values.

Now you know how to solve ValueError: cannot convert float NaN to integer in Python. We hope you find these solutions helpful.