python - convert to lowercase

// turn to lower/upper
string = string.upper()
string = string.lower()

// check if all letter are lower or upper
string.islower()
string.isupper()

# By Alan W. Smith and Petar Ivanov
s = "Kilometer"
print(s.lower())

# Python code for implementation of lower() 
  
# Checking for lowercase characters 
string = 'GEEKSFORGEEKS'
print(string.lower()) 
  
string = 'GeeksforGeeks'
print(string.lower()) 

startString = "TeST StrIng"
lowerCaseString = startString.lower()
print(lowerCaseString)
# Output -> "test string"

students = ['Sarah', 'Mary', 'Anna', 'Charlotte']

# Option 1
students_lower = map(lambda x: x.lower(), students)   # map() produces a generator
print(list(students_lower))                           # give all elements of the generator

# Option 2
students_lower = [student.lower() for student in students] # list comprehension

# Option 3
students_lower = (student.lower() for student in students) # generator comprehension
print(list(students_lower))