Converting a Python 2 socket example to Python 3
whois.py
import sys
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("whois.arin.net", 43))
s.send((sys.argv[1] + "\r\n").encode())
response = ""
while True:
data = s.recv(4096)
response += data
if not data:
break
s.close()
print(response)
If compile with Python 3, it prompts the following error?
Traceback (most recent call last):
File "C:\repos\hc\whois\python\whois.py", line 12, in <module>
response += data
TypeError: Can't convert 'bytes' object to str implicitly
Solution
In Python 3, the socket returns data as bytes (it was string in Python 2). Since the response is a string, you can’t add two different types (bytes + string) directly. To fix it, you need to convert the type :
#Solution 1 Convert the response from string to bytes
whois.py
import sys
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("whois.arin.net", 43))
s.send((sys.argv[1] + "\r\n").encode())
#Convert response to bytes
response = b""
# or use encode()
#response = "".encode()
while True:
data = s.recv(4096)
response += data
if not data:
break
s.close()
print(response.decode())
#Solution 2 Convert the data from bytes to string
whois.py
import sys
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("whois.arin.net", 43))
s.send((sys.argv[1] + "\r\n").encode())
response = ""
while True:
data = s.recv(4096)
#convert data from bytes to string
#response += data
response += data.decode()
if not data:
break
s.close()
print(response)
Yo tengo un código similar, he tratado de hacerle alguna modificaciones pero no logro solucionar el problema.
Estoy tratando de leer los valores de 3 sensores Arduino, HC-SR04, LM35 y DHT11, el DHT11 me da 3 valores (humedad, °C y °F), los 5 valores que trato de leer con el script Python son “int” en Arduino pero enviados como String.
Script Python:
import bluetooth
moduloHC05 = “00:21:13:02:B5:20”
puerto = 1
conexion = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
conexion.connect((moduloHC05, puerto))
datos = “”
while 1:
try:
datos += conexion.recv(4096)
datos_end = datos.find(‘\n’)
if datos_end != -1:
rec = datos[:datos_end]
print(datos)
#datos = datos[datos_end + 1:]
except KeyboardInterrupt:
break
conexion.close()
Error:
Traceback (most recent call last):
File “/home/pi/Desktop/lecturaHC05.py”, line 11, in
datos += conexion.recv(4096)
TypeError: Can’t convert ‘bytes’ object to str implicitly