最常用的字符串操作
# 长度：计算某个字符串长度
len("foo") # 3
# 截取：截取字符串的某段
str = "foo-bar"
sub_str1 = str[0:4] # foo-
sub_str2 = str[-4:] # -bar
# 分割：使用字符串切割字符串
txt = "127.0.0.1:8080"
txt.split(":") # ['127.0.0.1', '8080']
# 替换：替换字符串的某些内容
str = "This is string example....wow!!! this is really string"
str.replace("is", "was")
判断字符串为空
python – How to check if the string is empty? – Stack Overflow
if not myString:
# do stuff
两边去空白字符
"".strip() "".lstrip() "".rstrip()
格式化字符串
print("%s %s" % ("foo", "bar"))
编码转换
urllib.parse.quote(query) # 该函数不转码斜线
urllib.parse.quote_plus(query) # 转码空格到加号的所有字符
# Unicode decode
str.encode("utf-8").decode("unicode_escape")
二进制 ⇔ 普通字符串
b'bin string'.decode('ascii')
Base64, Endcoding and Decoding
Encoding and Decoding Base64 Strings in Python
import base64
message = "Python is fun"
message_bytes = message.encode('ascii')
base64_bytes = base64.b64encode(message_bytes)
base64_message = base64_bytes.decode('ascii')
import base64
base64_message = 'UHl0aG9uIGlzIGZ1bg=='
base64_bytes = base64_message.encode('ascii')
message_bytes = base64.b64decode(base64_bytes)
message = message_bytes.decode('ascii')
注意，如上示例，编码与解码函数需要输出字节
参考文献
Python Strings
How to convert ‘binary string’ to normal string in Python3?
How to encode URLs in Python
How do I treat an ASCII string as unicode and unescape the escaped characters in it in python?
Python Trim String – rstrip(), lstrip(), strip()