DHT-11 doesn't work

Question

I connected a DHT-11 to the GPIO04 pin and wrote this code down.

import Adafruit_DHT
sensor = Adafruit_DHT.DHT22
pin = 7
while True:
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
    print(temperature, humidity)

It just prints None None and does nothing else. Thanks for all the help!~

Edit: I ran this code

import sys
import pigpio
import DHT
import time
import datetime
Sensor should be set to DHT.DHT11, DHT.DHTXX or DHT.DHTAUTO
sensor = DHT.DHT11
pin = 4     # Data - Pin 7 (BCM 4)
def output_data(timestamp, temperature, humidity):
    # Sample output Date: 2019-11-17T10:55:08, Temperature: 25°C, Humidity: 72%
    date = datetime.datetime.fromtimestamp(timestamp).replace(microsecond=0).isoformat()
    print(u"Date: {:s}, Temperature: {:g}\u00b0C, Humidity: {:g}%".format(date, temperature, humidity))
pi = pigpio.pi()
if not pi.connected:
  exit()
s = DHT.sensor(pi, pin, model = sensor)
tries = 5   # try 5 times if error
while tries:
    try:
        timestamp, gpio, status, temperature, humidity = s.read()   #read DHT device
        if(status == DHT.DHT_TIMEOUT):  # no response from sensor
            exit()
        if(status == DHT.DHT_GOOD):
            output_data(timestamp, temperature, humidity)
            exit()      # Exit after successful read
        time.sleep(2)
        tries -=1
    except KeyboardInterrupt:
        break

and it came out as process ended as with exit code 0