Python String istitle()

Python String istitle() returns True if the string is title cased and not empty, otherwise it returns False. A string is title cased when all its words start with Uppercase characters and all other characters are in lowercase. If the string doesn’t contain any titlecased character, then also this function returns False.

Python String istitle()

Let’s look at some examples of Python String istitle() function.

s = 'A Big Cat'
print(s.istitle())

Output: True

s = 'A BIG Cat'
print(s.istitle())

Output: False because of ‘BIG’.

s = 'A big Cat'
print(s.istitle())

Output: False because of ‘big’.

s = 'a big cat'
print(s.istitle())

Output: False because the words are not starting with uppercase letter.

s = 'A'
print(s.istitle())

Output: True

s = ''
print(s.istitle())

Output: False because string is empty.

s = '2019'
print(s.istitle())

Output: False because string doesn’t contain any titlecased characters.

Let’s look at an example where the string contains special characters.

s = 'Â Ɓig Ȼat'
print(s.istitle())

Output: True because Â, Ɓ and Ȼ are title cased letters.

Print all Unicode title-cased characters

Here is a simple code snippet to print all the Unicode characters that are title cased.

import unicodedata

count = 0
for codepoint in range(2 ** 16):
    ch = chr(codepoint)
    if ch.istitle():
        print(u'{:04x}: {} ({})'.format(codepoint, ch, unicodedata.name(ch, 'UNNAMED')))
        count = count + 1
print(f'Total Number of Title Unicode Characters = {count}')

Output:

0041: A (LATIN CAPITAL LETTER A)
0042: B (LATIN CAPITAL LETTER B)
0043: C (LATIN CAPITAL LETTER C)
...
ff38: Ｘ (FULLWIDTH LATIN CAPITAL LETTER X)
ff39: Ｙ (FULLWIDTH LATIN CAPITAL LETTER Y)
ff3a: Ｚ (FULLWIDTH LATIN CAPITAL LETTER Z)
Total Number of Title Unicode Characters = 1185

Reference: Official Documentation