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The istitle() string method returns True if the invoked string has followed the rules of a naming a title i.e. -

• The first letter of each word in a string should be an upper case letter.
• Except, the first letter of each word, the rest of the characters should be in lower case.

Note : None of the string methods change the original string and only return a new string which reflects the change performed by the string method, hence the returned string must be stored or used(if needed to reflect the result), otherwise it is lost.

Signature of istitle()

The istitle() method has no parameters, so we don't have to worry about passing it some value.

# Signature of istitle() method 
istitle()

Calling istitle() method on a string object.




# Python - Method istitle() Example



# Creating a string
s1 = ('I Love Minions')


# Printing the original string
print('Value of string  : ', s1)


# Calling  the upper() method on string object 
print('Calling the istitle() method  on string : ', s1.istitle())





Output




Value of string : I Love Minions
Calling the upper() method  on string : True


A string object was initialized to a value I love Minions. When the method istitle() was called on this string object, it returned a bool value True, because the invoked string follows the rules of a naming a string as a title.




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Another example of istitle() method




# Python - Method istitle() Example



# Calling istitle() method on a string of all upper case characters
print('NEVER GIVE UP'.istitle())


# Calling istitle() method on a string of only digits
print('123'.istitle())



# Calling istitle() method on a string of digits and upper case characters
print('123.. Go!'.istitle())



# Calling istitle() method on a string of all upper case characters except one lowercase letter
print('Shine Like a Star!'.istitle())


# Calling istitle() method on a string with mix of non-alphabets and alphabetic characters
print('#1 Sun  2# Mercury 3# Venus 4# Earth #5 Jupiter #6 Saturn #7 Uranus #8 Neptune'.istitle())





Output is :




False
False
True
False
True



• First, we have called istitle() on a string of all upper case characters, hence False.
• Next, we have called istitle() on a string of only digits, hence False.
• Next, istitle() is called on a string which follows rules of a title, hence True.
• Next, istitle() is called on a string with its each first word in upper case(except one), hence False.
• Next, istitle() is called on a string with a mix of non-alphabetic character and upper case characters and it has followed the rules of a title, hence True.







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