Python String upper() function converts complete String into Uppercase and returns a new string. Strings are immutable in String, so the original string value remains unchanged.
Key Points :
- Return Type: String
- Parametric Values: No parameters can be passed into the upper() function.
- Converts whole of string into uppercase
- It does not modify the original string. The modified string can be saved with a new variable name.
Example: Given String – “Have a Nice Day” Or “Have A NICE DAY” Or “have a nice day” Or “Have a nice day”
New String After Using upper() Function: “HAVE A NICE DAY” (for all the above-given strings)
String upper() Syntax
str_name.upper()
Here str_name refers to the input string. And, upper() is inbuilt string function in python.
str_name = "welcome"
print(str_name.upper()) # WELCOME
String upper() Examples
Case 1: String is in lowercase and may contain number/special characters/whitespaces
str_name = "welcome 2020"
print(str_name.upper()) # WELCOME 2020
str_name = "welcome @2020"
print(str_name.upper()) # WELCOME @2020
Case 2: String is in Uppercase and may contain number/special characters/whitespaces
str_name = "WELCOME 2020"
print(str_name.upper()) # WELCOME 2020
str_name = "WELCOME @2020"
print(str_name.upper()) # WELCOME @2020
Case 3: Only first alphabet of every word in a string is Uppercase
str_name = "Python"
print(str_name.upper()) # PYTHON
str_name = "Python 2020"
print(str_name.upper()) # PYTHON 2020
Case 4: String contains only numbers or special characters
str_name = "2020"
print(str_name.upper()) # 2020
str_name = "@$&"
print(str_name.upper()) # @$&
Case 5: String is empty
str_name = ' '
print(str_name.upper()) # (Will not give any error and show empty space as output)
References
- Python string to Uppercase – str.upper()
- Python String Built-in Functions