方法一：
def str_count(str):
'''找出字符串中的中英文、空格、数字、标点符号个数'''
count_en = count_dg = count_sp = count_zh = count_pu = 0
for s in str:
# 英文
if s in string.ascii_letters:
count_en += 1
# 数字
elif s.isdigit():
count_dg += 1
# 空格
elif s.isspace():
count_sp += 1
# 中文
elif s.isalpha():
