combine two strings in python

Question

I have a list1 like this,

list1 = [('my', '1.2.3', 2),('name', '9.8.7', 3)]

I want to get a new list2 like this (joining first element with second element's second entry);

list2 = [('my2', 2),('name8', 3)]

As a first step, I am checking to join the first two elements in the tuple as follow,

for i,j,k in list1:
    #print(i,j,k)
    x = j.split('.')[1]
    y = str(i).join(x)
    print(y)

but I get this

2
8

I was expecting this;

my2
name8

what I am doing wrong? Is there any good way to do this? a simple way..

Matt Payne · Accepted Answer · 2025-06-20 22:25:13Z

5

You can try:

y = str(i) + str(x)

It should work.

edited Jun 20 at 22:25

Matt Payne

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answered Dec 15, 2019 at 18:30

Zig Razor

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Comments

willeM_ Van Onsem · Accepted Answer · 2019-12-15 18:35:37Z

4

The str(i).join(x), means that you see x as an iterable of strings (a string is an iterable of strings), and you are going to construct a string by adding i in between the elements of x.

You probably want to print('{}{}'.format(i+x)) however:

for i,j,k in list1:
    x = j.split('.')[1]
    print('{}{}'.format(i+x))

edited Dec 15, 2019 at 18:35

answered Dec 15, 2019 at 18:28

willeM_ Van Onsem

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1 Comment

Zig Razor Over a year ago

maybe is better to use str(n) for integer value before concatenation.

oppressionslayer · Accepted Answer · 2019-12-15 18:43:41Z

1

Try this:

for x in list1:
   print(x[0] + x[1][2])

or

for x in list1: 
   print(x[0] + x[1].split('.')[1])

output

# my2
# name8

answered Dec 15, 2019 at 18:43

oppressionslayer

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Comments

jandaluz · Accepted Answer · 2019-12-15 19:43:46Z

1

You should be able to achieve this via f strings and list comprehension, though it'll be pretty rigid.

list_1 = [('my', '1.2.3', 2),('name', '9.8.7', 3)]

# for item in list_1
# create tuple of (item[0], item[1].split('.')[1], item[2])
# append to a new list
list_2 = [(f"{item[0]}{item[1].split('.')[1]}", f"{item[2]}") for item in list_1]

print(list_2)

List comprehensions (and dict comprehensions) are some of my favorite things about python3

https://www.pythonforbeginners.com/basics/list-comprehensions-in-python
https://www.digitalocean.com/community/tutorials/understanding-list-comprehensions-in-python-3

answered Dec 15, 2019 at 19:43

jandaluz

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1 Comment

Jack Fleeting Over a year ago

Simple and to the point. Note that you don't really need to use f-strings here; [(item[0]+item[1].split('.')[1], item[2]) for item in list_1] should also work.

Subham · Accepted Answer · 2021-03-09 10:05:20Z

0

Going with the author's theme,

list1 = [('my', '1.2.3', 2),('name', '9.8.7', 3)]

for i,j,k in list1:
    extracted = j.split(".") 
    y = i+extracted[1] # specified the index here instead 
    print(y)

my2
name8

[Program finished]

answered Mar 9, 2021 at 10:05

Subham

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