题目:首先生成包含1000个随机字符的字符串,然后统计每个字符的出现次数 import string import random x = string.ascii_letters + string.digits + string.punctuation # print(x) y = [random.choice(x) for i in range(10)] #生成包含1000个随机字符的字符串 # print(y) d = dict() #使用字典保存每个字符出现次数 for ch in y:
dic=dict() d={} s=set() s='helloworld' (1)d=dict() for x in s: if x not in d.keys(): d[x]=1 else: d[x]=d[x]+1 print(d) (2)d2=dict() for x in s: d2[x]=d2.get(x,0)+1 print(d2) (3)d3=dict() for x in s: d3[x]=s.count(x) print(d3) 上面一共给出了三种方法,均是以字典的形式输出,但