Uppercasing Letters After '.', '!' And '?' Signs In Python

I have been searching Stack Overflow but cannot find the proper code for correcting e.g. 'hello! are you tired? no, not at all!' Into: 'Hello! Are you tired? No, not at all!'

Solution 1:

You can try this regex approach:

import re
re.sub("(^|[.?!])\s*([a-zA-Z])", lambda p: p.group(0).upper(), s)
# 'Hello! Are you tired? No, not at all!'

---

• (^|[.?!]) matches the start of the string ^ or .?! followed by optional spaces;
• [a-zA-Z] matches letter directly after the first pattern;
• use lambda function to convert the captured group to upper case;

Solution 2:

1. Use regular expressions to split at punctuation characters
2. Join everything back with capitalized letters at the start of the sentences.

For example like this:

importretext='hello! are you tired? no, not at all!'

punc_filter = re.compile('([.!?]\s*)')
split_with_punctuation = punc_filter.split(text)

final = ''.join([i.capitalize() for i in split_with_punctuation])
print(final)

Output:

>>>Hello! Are you tired? No, not at all!

Solution 3:

capitalize() method makes all letters small except the first one.

More general variant is:

def capitalize(text):
    punc_filter = re.compile('([.!?;]\s*)')
    split_with_punctuation = punc_filter.split(text)
    for i,j in enumerate(split_with_punctuation):
        if len(j) > 1:
            split_with_punctuation[i] = j[0].upper() + j[1:]
    text = ''.join(split_with_punctuation)
    return text

text = "hello Bob! are you tired? no, not at all!"capitalize(text)

Output:

'Hello Bob! Are you tired? No, not at all!'

Solution 4:

You could do something like

x = "hello! are you tired? no, not at all!"
y = x.split("? ")
z="" 
for line in y:
    z = "{} {}".format(z,line.capitalize())
print(z)

And adjust it to your needs.