Solve the name error pd not defined
Make sure to import the pandas library into your Python script or Jupyter notebook and assign it the alias pd before invoking any of the library methods:
import pandas as pd your_df = pd.DataFrame()
Reproducing the name error
Suppose that you run the following snippet in your Jupyter Notebook, Pycharm , Spyder, VS Code or other Python dev environment:
# define lists of column values month = ['September', 'November', 'March', 'September'] salary = [141.0, 140.5, 102.0, 153.0] interviews = dict(month = month, salary = salary) #create DataFrame hr = pd.DataFrame(data=interviews)
This will render a NameError exception. Here’s a screenshot from my Jupyter notebook:
Understanding the error
The root cause is that you are trying to use the pandas library before declaring it in your code. First you need to import the library, and then if interested define an alias for the library that you will use in your code.
Fixing the error
First off, make sure to verify that pandas is installed in your Python environment. Then make sure to import pandas and define the pd alias as shown below
import pandas as pd #rest of your code here hr = pandas.DataFrame(data=interviews)
Note: Although defining an alias for pandas (and other Python packages) in your code helps readability, that is not mandatory. You could as well use other alias than ‘pd’, although that is the standard notation.
Same code without using the ‘pd’ alias:
import pandas #rest of your code here hr = pandas.DataFrame(data=interviews)