'''
練習二：
    使用map()和reduce()函式實現
    自己實現一個函式，類似於upper()或lower()函式的功能
    例如：    string = 'ABCDEFG'
轉換之後    string = 'abcdefg
'''
# list_a = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
# list_b = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']
 
# for x in range(0,256):
#     print('%s--%s'%(x,chr(x)))
# 65-90
# 97-122
# rs = input('請輸入您要轉換的字元')
# list1 = []
# for x in rs:
#     a = ord(x)
#     if 65 <= a <= 90:
#         a = a + 32
#     elif 97 <= a <= 122:
#         a = a - 32
#     b = chr(a)
#     list1.append(b)
# print(list1)
 
# c = ''.join(list1)
# print(c)
# ABCDEFG 轉換為abcdefg
'''
    1.把ABCDEFG每一個字元轉換為小寫。'''
def LOWER(string):
# char_lower函式是作用到map()函式的。
def char_lower(s):
# 將26個英文字母對應的小寫字母，在字典中進行定義。
chars_dict = {'A': 'a', 'B': 'b', 'C': 'c', 'D': 'd', 'E': 'e', 'F': 'f', 'G': 'g', 'H': 'h', 'I': 'i',
                         'J'
 
: 'j', 'K': 'k', 'L': 'l', 'M': 'm', 'N': 'n', 'O': 'o', 'P': 'p', 'Q': 'q', 'R': 'r',
                         'S': 's', 'T': 't', 'U': 'u', 'V': 'v', 'W': 'w', 'X': 'x', 'Y': 'y', 'Z': 'z'}
# 根據s取值，如果取不到，就賦原值
char = chars_dict.get(s, s)
return char
    rs = list(map(char_lower, string))
rs = reduce(lambda x,y:x+y, rs)
return rs


res = LOWER('AbCdEF')
print(res)
print(type(res))