Adding a space between string words

Question

Write a function named string_processing that takes a list of strings as input and returns an all-lowercase string with no punctuation. There should be a space between each word. You do not have to check for edge cases.

Here is my code:

import string

def string_processing(string_list):
    str1 = ""
    for word in string_list:
        str1 += ''.join(x for x in word if x not in string.punctuation)
    return str1

string_processing(['hello,', 'world!'])
string_processing(['test...', 'me....', 'please'])

My output:

'helloworld'
'testmeplease'

Expected output:

'hello world'
'test me please'

How to add a space in just between words?

Answer 1

You just need to keep all the words separate and then join them later with a space between them:

import string
def string_processing(string_list):
    ret = []
    for word in string_list:
        ret.append(''.join(x for x in word if x not in string.punctuation))
    return ' '.join(ret)

print(string_processing(['hello,', 'world!']))
print(string_processing(['test...', 'me....', 'please']))

Output:

hello world
test me please

Answer 2

Try:

import string
def string_processing(string_list):
    str1 = ""
    for word in string_list:
        st = ''.join(x for x in word if x not in string.punctuation)
        str1 += f"{st} "  #<-------- here
    
    return str1.rstrip() #<------- here

string_processing(['hello,', 'world!'])
string_processing(['test...', 'me....', 'please'])

---

using regex:

import re
li = ['hello...,', 'world!']
st = " ".join(re.compile('\w+').findall("".join(li)))

Answer 3

Using re gex , remove every non-letter and then join with a space:

import re

def string_processing(string_list):
    return ' '.join(re.sub(r'[^a-zA-Z]', '', word) for word in string_list)

print(string_processing(['hello,', 'world!']))
print(string_processing(['test...', 'me....', 'please']))

Gives:

hello world
test me please

Answer 4

The following code could help.

import string
def string_processing(string_list):

    for i,word in enumerate(string_list):
        string_list[i] = word.translate(str.maketrans('', '', string.punctuation)).lower()

    str1 = " ".join(string_list)

    return str1

string_processing(['hello,', 'world!'])
string_processing(['test...', 'me....', 'please'])

Answer 5

We can use the re library to process the words and add a space between them

import re
string = 'HelloWorld'
print(re.sub('([A-Z])', r' \1', string))

Output:

Hello World