python str ord chr 字符串赋值 trailing comma 尾巴逗号

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Here are examples:

a = '12y'
# ch = ord(a) TypeError: ord() expected a character, but string of length 3 found
ch = chr(ord(a[0])+1)
print(ch) #2ch = chr(ord(a[2])+1)
print(ch) #z#给字符串赋值没有太好的方式，切片是有效操作之一
#a[1] = 'x' #TypeError: 'str' object does not support item assignment
a = a[:1]+'x'+a[2:]
print(a) #1xy#或者变成list
a_list = list(a)
a_list[1] = 'e'
print(''.join(a_list)) #1eya = [[]]
# a[-1][1:] = 3 #肯定会崩
a[-1][1:] = 3, #相当于a[-1].append(3)
print(a)

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