字符串 ’字符‘个数转化 字典 ’ 键值对‘表达习题练习

类型1
s1 = 'jason say hello hello hello big baby baby baby sb sb jason jason'
# 统计每个单词的个数
# 1.定义一个空字典
data_dict = {}
# 2.如果是拿每个单词 则使用切割
new_list = s1.split(' ')  # ['jason','say',...]
# 3.for循环列表中每个单词
for i in new_list:  # jason say hello hello ...
    if i in data_dict:  # i=jason  {}
        # 取出i对应的值自增1即可
        data_dict[i] += 1
    else:
        # 新增一组键值对
        data_dict[i] = 1  # data_dict['jason'] = 1   {'jason':1}
print(data_dict)  # {'jason': 3, 'say': 1, 'hello': 3, 'big': 1, 'baby': 3, 'sb': 2}



类型2

s2 = 'jasonsayhello'
# 统计每个字符
# data_dict = {}
# # 直接循环字符串
# for i in s2:
#     if i in data_dict:
#         data_dict[i] += 1
#     else:
#         data_dict[i] = 1
# print(data_dict)