import random
m_str = "".join(random.choices("qwertyuioplkjhgfdsazxcvbnm", k=1000))
print("字符串长度",len(m_str))
# set集合去重
m_set = set(m_str)
# 遍历，长度为set集合，键值放入字典中
m_dict = {}
for i in m_set:
nums = m_str.count(i) # 母串中每个字符出现的次数
m_dict[i] = nums
# 打印结果
for i in m_dict.items():
print(i, end=" ")
