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pythonwhile-loop
Sudhanshu kumar
Sudhanshu kumar

Reputation: 15

How is while loop working in the python code below?

How is this while loop working?

myfile = open(r'E:\poem.txt',"r")
str=" " 
while str: 
    str = myfile.readline() 
    print(str,end=" ") 
myfile.close()

Upvotes: 0

Views: 84

Answers (2)

Shir
Shir

Reputation: 1649

myfile.readline() returns an empty string in case it has no more lines to read from the file. This is the only case in which it returns this value. Therefore, one can use it as a boolean condition in while or if statements.

Hence, in the example above, the while loop stops when there are no more lines to read.

See this post for further information.

Upvotes: 2

gribvirus74
gribvirus74

Reputation: 765

I don't think it's the best solution. Here's a more pythonic one:

with open(r'E:\poem.txt') as myfile:
    for line in myfile:
        print(line, end=' ')

with statement will automatically close the file for you.

Upvotes: 1

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