"TypeError: 'dict' object is not callable" in Python pandas DataFrame

Question

I imported pandas as pd.

>>>import pandas as pd

Assigned Series variables 'city_names' and 'population'

>>> city_names=pd.Series(['San Fransisco','San Jose','Sacromento'])
>>> population=pd.Series([8964,91598,034892])

Created DataFrame

>>> pd.DataFrame=({'City Name': city_names, 'Population':population})

While assigning DataFrame to the variable 'cities',

>>> cities=pd.DataFrame({'City Name ' : city_names, 'Population' : population})

I am getting the following error :

Traceback (most recent call last):
  File "<pyshell#17>", line 1, in <module>
    cities=pd.DataFrame({'City Name ' : city_names, 'Population' : population})
TypeError: 'dict' object is not callable

Also aware that 'dict' is a dictionary with (key,value) pairs! please let me know why this error occurs. I looked into other questions as well but could'nt find help.

Please also let me know how to access the 'cities' variable as a two dimensional array or list if possible. — Vikranth Inti
– Vikranth Inti, Commented Mar 2, 2018 at 6:52

piRSquared · Accepted Answer · 2018-03-02 06:47:30Z

3

Your code pd.DataFrame=({'City Name': city_names, 'Population':population}) replaced pd.DataFrame function with a dictionary.

@Ankur please modify this edit to your liking.
PiR edit:

pd.DataFrame is a class defined by pandas. A class is "callable" meaning that you can call it with parentheses like so pd.DataFrame(). However, in Python the = is an assignment operator and you did pd.DataFrame = {} which assigned some dictionary to the same spot that the DataFrame class constructor used to be. You should not use that line specified by @Ankur. It will break your stuff every time.

edited Mar 2, 2018 at 6:47

piRSquared

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answered Mar 2, 2018 at 6:22

Ankur

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9 Comments

piRSquared Over a year ago

What you did was accidentally assigned a dictionary to the DataFrame attribute of the pd module. Then when you tried to create a data frame by calling the data frame constructor pd.DataFrame, python found a dictionary instead of the constructor. Whoops!

Ankur Over a year ago

Yeah, coz before creating cities variable you have assigned a dictionary to pd.DataFrame. Restart your python repl and run your code again except don't run the line that I mentioned in my answer.

piRSquared Over a year ago

Or use import importlib; importlib.reload(pd)

piRSquared Over a year ago

pd.DataFrame is a class defined by pandas. A class is "callable" meaning that you can call it with parentheses like so pd.DataFrame(). However, in Python the = is an assignment operator and you did pd.DataFrame = {} which assigned some dictionary to the same spot that the DataFrame class constructor used to be. You should not use that line specified by @Ankur. It will break your stuff every time.

jezrael Over a year ago

@piRSquared - Maybe the best is add this comments to answer, because very valuable, what do you think? Is possible edit Ankur answer?

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