python 非法字符处理

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过滤非法字符

def sql_filter(sql, max_length=20):
    dirty_stuff = ["\"", "\\", "/", "|", "&", "*", "'", "=", "-", "#", ";", "<", ">", "+", "%", "$", "(", ")", "%", "@","!"]
    for stuff in dirty_stuff:
        sql = sql.replace(stuff, "")
    return sql[:max_length]

username = "1234567890!@#!@#!@#$%======$%|&***"

username = sql_filter(username)  # SQL注入
print(username)

# 输出结果是:1234567890

检测是否包含非法字符

import re

# username = "1234567890!@#!@#!@#$%======$%|&***"
username = "1234567890*"

# 检测到非法字符进入if
if not re.search(u'^[_a-zA-Z0-9\u4e00-\u9fa5]+$', username):
    msg = u"用户名不可以包含非法字符(!,@,#,$,%...)"
    print(msg)