python - Struggling to get a simple function running from command line -

i'm trying below function running command line using

python filename.py 

however, isn't doing want.

could please me out this? i'm sure i'm missing simple...

 infile = ""  infile = raw_input("enter file name: ")  x = open(infile, 'w')   def summation(x):      sum = 0      in x:          sum = sum +      return sum   if __name__ == "__main__":      print(summation(x)) 

hopefully it's self explanatory i'm trying achieve, in case it's not...

i'm asking raw_input; text file full of numbers (each on it's own line). file should fed variable x used in summation function. finally, loop each value summed , sum returned (and printed in terminal).

there 2 problems:

• you're opening file in write mode. deletes contents of file. drop "w" parameter.
• you can't add strings (as read file) integer. need convert them integers first: sum += int(i)

also, should close file after you've read contents. , line infile = "" unnecessary.