Python 如何使字节字符串成为普通字符串？

我有一个pythonwebserver，它主要处理POST请求并将它们写入文本文件，但在文本文件中写入的

b'string'

不适合我将使用字符串的目的。那么如何将其转换为普通字符串呢

这是我的密码

from http.server import HTTPServer, BaseHTTPRequestHandler

from io import BytesIO


class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.end_headers()
        self.wfile.write("Page is only for POST")

    def do_POST(self):
        content_length = int(self.headers['Content-Length'])
        body = self.rfile.read(content_length)
        self.send_response(200)
        self.end_headers()
        response = BytesIO()
        response.write(b"POST")
        txt = open("POST.txt", "w")
        txt.write(str(body))
        response.write(body)
        self.wfile.write(response.getvalue())
        print(body)

httpd = HTTPServer(('localhost', 8000), SimpleHTTPRequestHandler)
httpd.serve_forever()

---

您正在从请求接收原始字节；除非您需要修改编码，否则您应该只写入原始字节，而不是尝试写入文本。在这种情况下，唯一需要更改的是：

txt = open("POST.txt", "w")
txt.write(str(body))

致：

要正确地完成这项工作，它实际上应该是：

with open("POST.txt", "wb") as txt:
    txt.write(body)

---

因此

with

语句确保数据被及时写入，文件以确定的方式正确关闭。

通过HTTP接收的数据是字节形式的。在将其写入文件之前，需要对其进行解码。将

txt.write（str（body））

替换为

txt.write（body.decode（“utf-8”）

。这将把代码转换回字符串格式。 完整的代码如下所示：

from http.server import HTTPServer, BaseHTTPRequestHandler

from io import BytesIO


class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.end_headers()
        self.wfile.write("Page is only for POST")

    def do_POST(self):
        content_length = int(self.headers['Content-Length'])
        body = self.rfile.read(content_length)
        self.send_response(200)
        self.end_headers()
        response = BytesIO()
        response.write(b"POST")
        txt = open("POST.txt", "w")
        txt.write(body.decode("utf-8"))
        response.write(body)
        self.wfile.write(response.getvalue())
        print(body)

httpd = HTTPServer(('localhost', 8000), SimpleHTTPRequestHandler)
httpd.serve_forever()

---

谢谢，您的代码运行正常，我的文件不再有字节字符串。

from http.server import HTTPServer, BaseHTTPRequestHandler

from io import BytesIO


class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.end_headers()
        self.wfile.write("Page is only for POST")

    def do_POST(self):
        content_length = int(self.headers['Content-Length'])
        body = self.rfile.read(content_length)
        self.send_response(200)
        self.end_headers()
        response = BytesIO()
        response.write(b"POST")
        txt = open("POST.txt", "w")
        txt.write(body.decode("utf-8"))
        response.write(body)
        self.wfile.write(response.getvalue())
        print(body)

httpd = HTTPServer(('localhost', 8000), SimpleHTTPRequestHandler)
httpd.serve_forever()