Python : how to use another method's returning value in another method?

Question

what i am trying to do is get a returning value from abcd method, and use this value to as a the substitue of fname and the error is continues to occur.

how can i fix this error?

ICB164000395.txt has four lines. and i want line_count print out 4(The number of lines in the text file)

class Test():
    def abcd(self):
        self.a = a
        a = 'ICB164000395.txt'
        return a


    def line_count(self, fname):
        with open(fname) as f:
            for i, l in enumerate(f):
                pass
        return i + 1
        print(i + 1)

t = Test()
t.line_count(abcd())

and the error appears like this

Traceback (most recent call last): File "C:\Users\mg\Desktop\Tubuc\openAPI\test9.py", line 16, in t.line_count(abcd(fname)) NameError: name 'abcd' is not defined

What is the error? Please include the full traceback in the question. — glibdud
– glibdud, Commented Aug 9, 2018 at 13:16
You're not providing a full file path so I assume the "error" is to do with not knowing where to look for your file. — Sayse
– Sayse, Commented Aug 9, 2018 at 13:17

Prashant · Accepted Answer · 2018-08-09 13:20:11Z

1

Just looking at the function:

def abcd(self):
    self.a = a
    a = 'ICB164000395.txt'
    return a

I'm guessign you're getting an error at self.a = a .. Because a is not defined yet. It's not passed in either.

I think what you want is:

class Test():
    def abcd(self):
        a = 'ICB164000395.txt' # you'll need to correct the path to this file
        return a


    def line_count(self, fname):
        with open(fname) as f:
            for i, l in enumerate(f):
                pass
        return i + 1
        print(i + 1)

t = Test()
t.line_count(t.abcd())

answered Aug 9, 2018 at 13:20

Prashant

1,06412 silver badges29 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Cory Kramer · Accepted Answer · 2018-08-09 13:21:38Z

0

abcd is an instance method so you have to call it from an instance of your class

t = Test()
t.line_cont(t.abcd())

Your abcd method also uses the variable a before it is ever defined, so you could change it to

def abcd(self):
    self.a = 'ICB164000395.txt'
    return self.a

edited Aug 9, 2018 at 13:21

answered Aug 9, 2018 at 13:19

Cory Kramer

119k19 gold badges176 silver badges233 bronze badges

Comments

python_data_egghead · Accepted Answer · 2018-08-09 13:32:23Z

0

It appears what you want from your abcd method is typically handled in an init. You can set the file name when you instantiate a Test object. Then you can call the line count. Your line_count method should also specify how you are opening the file 'r' for read mode.

class Test():
    def __init__(self, file_name):
        self._file_name = file_name


    def line_count(self):
        with open(self._file_name, 'r') as f:
            for i, l in enumerate(f):
                pass
        return i + 1
        print(i + 1)

t = Test('ICB164000395.txt')
t.line_count()

answered Aug 9, 2018 at 13:32

python_data_egghead

412 bronze badges

Collectives™ on Stack Overflow

Python : how to use another method's returning value in another method?

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related