CODEWITHSUNDEEP
pythonpython-3.xconcatenation
Billjk
Billjk

Reputation: 10686

Print the concatenation of the digits of two numbers in Python

Is there a way to concat numbers in Python, lets say I have the code

print(2, 1)

I want it to print 21, not 2 1and if i use "+", it prints 3. Is there a way to do this?

Upvotes: 4

Views: 18971

Answers (10)

Subham
Subham

Reputation: 411

print(f'{2}{1}') gives

21

[Program finished]

The format used by OP. It's <class 'str'>

Upvotes: 0

Kuladip
Kuladip

Reputation: 1

If we do not want to convert it into a string.

val = [1,2,3,4] reduce(lambda x,y: x*10+y, val)

or after getting the result. convert it back to Integer.

Upvotes: 0

Nishu Pandey
Nishu Pandey

Reputation: 1

Simply use

c="2"+"1"
print(c)

It will give you 21.

Upvotes: -1

Rafael Almeida
Rafael Almeida

Reputation: 10732

Use the string formatting operator:

print "%d%d" % (2, 1)

EDIT: In Python 2.6+, you can also use the format() method of a string:

print("{0}{1}".format(2, 1))

Upvotes: 10

Rik Poggi
Rik Poggi

Reputation: 29302

If you have a lot of digits use str.join() + map():

print(''.join(map(str, [2,1])))

Otherwise why not simply do:

print(2*10+1)

Upvotes: 6

strcat
strcat

Reputation: 5622

You can change the separator used by the print function:

print(2, 1, sep="")

If you're using python2.x, you can use

from __future__ import print_function

at the top of the file.

Upvotes: 8

Open AI - Opting Out
Open AI - Opting Out

Reputation: 24153

>>> import sys
>>> values = [1, 2, 3, 4, 5]
>>> for value in values:
        sys.stdout.write(str(value))
12345

Upvotes: 2

Fred
Fred

Reputation: 1021

If you use python 3.x or 2.7, use format

print("{0}{1}".format(2, 1))

Upvotes: 3

Raul Marengo
Raul Marengo

Reputation: 2373

You could perhaps convert the integers to strings:

print(str(2)+str(1))

Upvotes: 10

ninjagecko
ninjagecko

Reputation: 91132

This is because 2 and 1 are integers, not strings. In general if you want to do this in any context besides printing, you'd have to convert them to strings first. For example:

myNumber1 = ...
myNumber2 = ...
myCombinedNumberString = str(myNumber1)+str(myNumber2)

In the context of printing, you'd much rather do what Rafael suggests in his answers (string format operator). I'd personally do it like:

print( '{}{}'.format(2,1) )

Upvotes: 5

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