The upper() method of str class in Python

# Example Python program that converts strings 
# of various cases to uppercase

# Lowercase to uppercase
txt = "warning";
print("Lowercase:%s"%txt);
print("Uppercase:%s"%txt.upper());

# Titlecase to uppercase
txt = "New York City";
print("Titlecase:%s"%txt);
print("Uppercase:%s"%txt.upper());

# Mixed to uppercase
txt = "Lakes of the world";
print("Mixed case:%s"%txt);
print("Uppercase:%s"%txt.upper());

Lowercase:warning

Uppercase:WARNING

Titlecase:New York City

Uppercase:NEW YORK CITY

Mixed case:Lakes of the world

Uppercase:LAKES OF THE WORLD

# Example Python program that converts lowercase 
# unicode characters into uppercase unicode 
# characters using str.upper()

# Hello world - Russian
lowercaseUnicode ="привет, мир!"

# Convert to upper case - Russian
uppercaseUnicode = lowercaseUnicode.upper()

print("Hello world in Russian(in lower case):")
print(lowercaseUnicode)

print("Hello world in Russian(in upper case):")
print(uppercaseUnicode)

print("Unicode | In decimal | In hexadecimal")
# The unicode values for Cyrillic lower case letters
for char in lowercaseUnicode:
    print("{}-{}-{}".format(char, ord(char), hex(ord(char))))

print("Unicode | In decimal | In hexadecimal")
# The unicode values for Cyrillic upper case letters
for char in uppercaseUnicode:
    print("{}-{}-{}".format(char, ord(char), hex(ord(char))))