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case2.1:統(tǒng)計(jì)子串在字符串中出現(xiàn)的次數(shù)：
# -*- coding:utf-8 -*-
# Copyright (c)2019, KanShan,All rightsreserved
# Author：KanShan
#Description：用戶輸入一個(gè)字符串和一個(gè)子串指孤，例如‘ABCDCDC’和'CDC',輸出子串出現(xiàn)的次數(shù)。
mother_chars = input("please input a long characters:")
son_chars = input("please input a short characters:")
count = 0
for i in range(len(mother_chars) -1):
if mother_chars[i: i+len(son_chars)] == son_chars:
count += 1
print("The counts of %s is in %s is:%d" % (son_chars, mother_chars, count))
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case2.2:修改字符串位置對應(yīng)的字符
# -*- coding:utf-8 -*-
# Copyright (c)2019, KanShan,All rightsreserved
# Author：KanShan
#Description:用戶輸入一個(gè)字符串月培，修改該字符串中哪個(gè)位置的字符诚些，程序就會(huì)輸出修改后的結(jié)果
strings = input("Please input a string:")
print("Your input string is:%s" % strings)
number, value = input("Input your change location number and changed value \
with Space bar separate:").split()
num_to_int = int(number)
string_to_list = list(strings)
string_to_list[num_to_int - 1] = value
print("Changed strings is: %s" % ''.join(string_to_list))
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2.變量和簡單的類型.jpeg
