Using one module inside another in Python

Question

I am trying to make some code a bit more modular in Python and am running into one issue which I'm sure is straight forward but I can't seem to see what the problem is.

Suppose I have a script, say MyScript.py:

import pandas as pd
import myFunction as mF

data_frame = mF.data_imp()

print(data_frame)

where myFunction.py contains the following:

def data_imp():
    return pd.read_table('myFile.txt', header = None, names = ['column'])

Running MyScript.py in the command line yields the following error:

    Traceback (most recent call last):
      File "MyScript.py", line 5, in <module>
        data_frame = mF.data_imp()
      File "/Users/tomack/Documents/python/StackQpd/myFunction.py", line 2, in data_imp
        return pd.read_table('myFile.txt', header = None, names = ['column'])
    NameError: name 'pd' is not defined

Thanks, so another question would be, suppose I had a set of python files - myFunction1.py, myFunction2.py, myFunction3.py - each containing functions that use 'read_table' from pandas and are called in MyScript.py, how can I minimise the number of times I type 'import pandas as pd'? — user2025161
– user2025161, Commented Feb 14, 2018 at 13:14

Simbarashe Timothy Motsi · Accepted Answer · 2018-02-14 13:12:18Z

3

You need to import pandas in your function or script myFunction:

def data_imp():
    import pandas as pd
    return pd.read_table('myFile.txt', header = None, names = ['column'])

edited Feb 14, 2018 at 13:12

answered Feb 14, 2018 at 13:06

Simbarashe Timothy Motsi

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Comments

rostamn739 · Accepted Answer · 2018-02-14 17:02:24Z

0

Answers here are right, because your module indeed lacks myFunction import.

If stated more broad this question can also contain following: in case of circular import the only 2 remedies are:

import pandas as pd , but not from pandas import something
Use imports right there in functions you need in-placd

answered Feb 14, 2018 at 17:02

rostamn739

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