How do you accept multiple line inputs in python?

I want to write a program that gets multiple line input and work with it line by line. Why isn't there any function like raw_input in Python 3?

input does not allow the user to put lines separated by newline [Enter]. It prints back only the first line.

Can it be stored in a variable or even read it to a list?

asked May 14, 2015 at 13:49

7

raw_input can correctly handle the EOF, so we can write a loop, read till we have received an EOF [Ctrl-D] from user:

Python 3

print["Enter/Paste your content. Ctrl-D or Ctrl-Z [ windows ] to save it."]
contents = []
while True:
    try:
        line = input[]
    except EOFError:
        break
    contents.append[line]

Python 2

print "Enter/Paste your content. Ctrl-D or Ctrl-Z [ windows ] to save it."
contents = []
while True:
    try:
        line = raw_input[""]
    except EOFError:
        break
    contents.append[line]

answered Jul 6, 2016 at 11:47

xiaketxiaket

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4

In Python 3.x the raw_input[] of Python 2.x has been replaced by input[] function. However in both the cases you cannot input multi-line strings, for that purpose you would need to get input from the user line by line and then .join[] them using \n, or you can also take various lines and concatenate them using + operator separated by \n

To get multi-line input from the user you can go like:

no_of_lines = 5
lines = ""
for i in xrange[no_of_lines]:
    lines+=input[]+"\n"

print[lines]

Or

lines = []
while True:
    line = input[]
    if line:
        lines.append[line]
    else:
        break
text = '\n'.join[lines]

AMGMNPLK

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answered May 14, 2015 at 13:51

ZdaRZdaR

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3

input[prompt] is basically equivalent to

def input[prompt]:
    print[prompt, end='', file=sys.stderr, flush=True]
    return sys.stdin.readline[]

You can read directly from sys.stdin if you like.

lines = sys.stdin.readlines[]

lines = [line for line in sys.stdin]

five_lines = list[itertools.islice[sys.stdin, 5]]
    

The first two require that the input end somehow, either by reaching the end of a file or by the user typing Control-D [or Control-Z in Windows] to signal the end. The last one will return after five lines have been read, whether from a file or from the terminal/keyboard.

answered May 14, 2015 at 14:45

chepnerchepner

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9

Use the input[] built-in function to get a input line from the user.

You can read the help here.

You can use the following code to get several line at once [finishing by an empty one]:

while input[] != '':
    do_thing

answered May 14, 2015 at 13:52

maggickmaggick

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1

no_of_lines = 5
lines = ""
for i in xrange[5]:
    lines+=input[]+"\n"
    a=raw_input["if u want to continue [Y/n]"]
    ""
    if[a=='y']:
        continue
    else:
        break
    print lines

answered Jul 5, 2016 at 5:10

1

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