reading N lines in python [duplicate]

Question

I am trying to read N lines of file in python.

This is my code

N = 10 counter = 0 lines = [] with open(file) as f: if counter < N: lines.append(f:next()) else: break

Assuming the file is a super large text file. Is there anyway to write this better. I understand in production code, its advised not to use break in loops so as to achieve better readability. But i cannot think of a good way not to use break and to achieve the same effect.

I am a new developer and am just trying to improve my code quality.

Any advice is greatly appreciated. Thanks.

Organis · Accepted Answer · 2017-01-12 02:40:57Z

There's no need to break, just iterate N times.

lines = [] afile = open('...') for i in range(N): aline = afile.readln() lines.append(aline) afile.close()

Quentin Roy · Accepted Answer · 2017-01-12 02:48:50Z

There is no loop in your code.

N = 10 counter = 0 lines = [] with open(file) as f: for line in f: lines.append(line) counter += 1 if counter > N: break

(I let you handle the edge case with N = 0 if you need to.)

Or just

import itertools N = 10 with open(file) as f: lines = list(itertools.islice(f, N))

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