Python 获取以[开头的字符串

# 定义一个字符串
s = "[Python is a great language"

# 判断字符串是否以`[`开头
if s.startswith("["):
    print(s)

[Python is a great language

import re

# 定义一个字符串
s = "[Python is a great language"

# 使用正则表达式匹配以`[`开头的字符串
match = re.match(r'\[.*', s)
if match:
    print(match.group())

[Python is a great language

# 定义一个字符串
s = "[Python is a great language"

# 遍历字符串，找到以`[`开头的字符串
result = ""
for char in s:
    if char == "[":
        result += char
    else:
        break

print(result)

[

# 定义一个字符串
s = "[Python is a great language"

# 使用切片获取以`[`开头的字符串
if s[:1] == "[":
    print(s)

[Python is a great language