Question

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Learn Python the Hard Way Exercise 17 Extra Question(S)

In this exercise I have to rewrite the code in one line. I tried to write the lines of code like this(from sys import argv,from os.path import exists) but it gives me a syntax error. So, I’m very curious, how can I write this exercise on one line?

Here is the code from the book:

from sys import argv
from os.path import exists

script, from_file, to_file = argv

print "Copying from %s to %s" % (from_file, to_file)


indata = open(from_file).read()

print "The input file is %d bytes long" % len(indata)

print "Does the output file exist? %r" % exists(to_file)
print "Ready, hit RETURN to continue, CTRL-C to abort."
raw_input()

output = open(to_file, 'w')
output.write(indata)

print "Alright, all done."


output.close()

Answer 1

Use ; to separate statements instead of ,.

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I don’t think the purpose of the exercise is simply concatenating the lines and separating them with a semicolon. You should try to actually minimize the code.

For example:

output = open(to_file, 'w')
output.write(indata)

print "Alright, all done."

output.close()

Can be replaced with:

with open(to_file, 'w') as output: output.write(indata)