[Python] Day 16 (3/5) -- lower(), upper()

 

# 76) =================================================================
def str_upper(myString):
    return myString.upper()

'''
solution = lambda n : n.upper()
'''
'''
JS
const solution = s => s.toUpperCase()

Java
return myString.toUpperCase();
'''

print(str_upper("aBcDeFg"))     # "ABCDEFG"


# 77) =================================================================
def str_lower(myString):
    return myString.lower()

print(str_lower("aBcDeFg"))     # "abcdefg"


# 78) =================================================================
# 홀수 인덱스 -> 소문자 변환, 짝수 인덱스 -> 대문자 변환
def odd_A_even_a(strArr):
    return [strArr[i].lower() if i%2==0 else strArr[i].upper() for i in range(len(strArr))]

'''
# range 보다 enumerate 를 사용하여 index 사용 권장
return [s.lower() if i % 2 == 0 else s.upper() for i, s in enumerate(strArr)]
'''

print(odd_A_even_a(["AAA","BBB","CCC","DDD"]))  # ["aaa","BBB","ccc","DDD"]