String method part 1

lower()

This method changes characters inside a string from upper to lower case. Symbols and numbers are ignored

Syntax
string.lower()

Example

str = 'PyTHon'
lower_case  = str.lower()
print(lower_case)

Output

python

upper()

Converts a string into uppercase

Syntax
string.upper()

Exmaple

str = 'python programming'
upper_case  = str.upper()
print(upper_case)

Output

PYTHON PROGRAMMING

capitalize()

This method will capitalize(uppercase) the first character in the string and the rest of the characters in lower case

Syntax
string.capitalize()

Example

str = 'python programming'
cap  = str.capitalize()
print(cap)

Output

Python programming

Let see what happen if the first character in the string is number

str = '23 python programming'
cap  = str.capitalize()
print(cap)

Output

23 python programming

islower()

This method return true if all characters are in lower case, otherwise false

Syntax
string.islower()

Example

str1 =' New york'
str2 = 'london'
str3 = 'Paris'
print(str1.islower())
print(str2.islower())
print(str3.islower())

Output

False
True
False