How to read a large file - line by line?

Question

I want to iterate over each line of an entire file. One way to do this is by reading the entire file, saving it to a list, then going over the line of interest. This method

Answer 1

#Using a text file for the example
with open("yourFile.txt","r") as f:
    text = f.readlines()
for line in text:
    print line

• Open your file for reading (r)
• Read the whole file and save each line into a list (text)
• Loop through the list printing each line.

If you want, for example, to check a specific line for a length greater than 10, work with what you already have available.

for line in text:
    if len(line) > 10:
        print line