python no module named serial

Question

I am having a problem with my python program. I wrote the program to get the data(temperature) from arduino to my raspberry pi sqlite database. but it gives me an error at line4(import serial) saying "ImportError: No module named serial". I use python3 and have already updated the pyserial. i am new in python so i am making some mistakes...

 #!/ussr/bin/python
 # -*- coding: utf-8 -*-

 import serial
 import datetime
 import sqlite3 as lite
 import sys
 import time

 ser = serial.Serial('/dev/ttyACM1', 9600, timeout=1)
 ser.open()

 count = 0

 con = lite.connect('realtime_data.db')

 try:
       while 1:
         indata = ser.readline()
         current_time = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
         count = count + 1

         print (count)

         with con:
           cur = con.cursor()
           cur.execute("INSERT INTO Temperatures VALUES( ?, ?, ? )", (count, current_time, indata))
           if count > 100:
             cur.execute("DELETE FROM Temperatures")
             count = 0

        # time.sleep(3) #upload to database every 5 seconds

 except KeyboardInterrupt:
       ser.close()

Answer 1

Here's a question about How to install pip with Python 3?. After that, you could use pip to install pyserial compatible with python-3.x, like the following:

$ sudo pip3 install pyserial

Here is a doc about how to install pyserial using its source code compatible with python-3.x

P.S.： If there are both python-2.x and python-3.x on your platform, like Arch Linux, when you want to install some packages, you should be careful to choose which python version the package should be compatible with and then use pip2 or pip3 to get and install those packages.

Answer 2

If The Filename you have saved is same as Module name then it will give you error. For example if your file name is "serial.py" and you have import serial, then it will first check in serial.py for the methods you have declared.