Opening files in Python

Question

I am getting a weird error when I try to open a file in my python program even though they are in the same directory. Here is my code:

def main():
#filename = input("Enter the name of the file of grades: ")

file = open("g.py", "r")
for line in file:
    points = 0

    array = line.split()

    if array[1] == 'A':
        points = array[2] * 4
    elif array[1] == 'B':
        points = array[2] * 3
    elif array[1] == 'C':
        points = array[2] * 2
    elif array[1] == 'D':
        points = array[2] * 1

    totalpoints += points
    totalpointspossible += array[2]*4

gpa = (totalpoints/totalpointspossible)*4
print("The GPA is ", gpa)

file.close()

main()

and this is the error I am getting:

Traceback (most recent call last):
File "yotam2.py", line 51, in <module>
main()
File "yotam2.py", line 28, in main
file = open(g.py, "r")
NameError: global name 'g' is not defined

I am not quite sure why it is saying g is not defined, even though it is in the same directory as my python file.

You may want to fix the whitespace in your code. And it looks like you have some undefined variables as well? — user1444165
– user1444165, Commented May 2, 2013 at 7:02

Blender · Accepted Answer · 2013-05-02 06:57:34Z

5

g.py should be a string:

file = open("g.py", "r")

Also, array is a list of strings. Multiplying strings by integers just duplicates them:

>>> "1" * 4
"1111"

You have to convert array (which isn't an array, by the way) into a list of numbers:

array = [int(n) for n in line.split()]

answered May 2, 2013 at 6:57

Blender

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10 Comments

Blender Over a year ago

@bagelboy: Probably a TypeError near totalpoints += points?

Blender Over a year ago

@bagelboy: Your code and the error message don't match up. Are you editing the same file?

sbru Over a year ago

What do you mean by "don't match up"

Blender Over a year ago

@bagelboy: The error message points to a line of code that doesn't exist in your file: open(g.py, "r"). You already changed that.

sbru Over a year ago

yeah haha that is why I posted this on SO. It doesn't make sense to me. I save it and run it in the shell and it gives me that error

|

Arxo Clay · Accepted Answer · 2013-05-02 06:58:34Z

0

You might want to enclose g.py in quotes.

The interpreter thinks g is a variable you are referencing rather than a filename you intend it to reference.

answered May 2, 2013 at 6:58

Arxo Clay

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Comments

Ankit Jaiswal · Accepted Answer · 2013-05-02 07:32:24Z

0

g.py must be replaced by "g.py" and totalpoints must be initialized

edited May 2, 2013 at 7:32

Ankit Jaiswal

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answered May 2, 2013 at 7:07

wangsquirrel

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