我正在尝试在 aplc s7 1200和 an之间建立通信rpi 3，我已经安装了，snap7但是在执行此代码时出现以下错误：
没有名为 snap7 的模块
这是我的代码：
from time import sleep
import snap7
from snap7.util import *
import struct
plc = snap7.client.Client()
plc.connect("192.168.12.73",0,1)
area = 0x82 # area for Q memory
start = 0 # location we are going to start the read
length = 1 # length in bytes of the read
bit = 0 # which bit in the Q memory byte we are reading
byte = plc.read_area(area,0,start,length)
print "Q0.0:",get_bool(mbyte,0,bit)
plc.disconnect()