[Solved] Identify the error in this pyserial code snippet: import serial ser = serial.Serial('/dev/ttyUSB0', 9600) ser.write('Hello') ser.close() | Raspberry Pi

Raspberry Pi - Serial UART Communication

Identify the error in this pyserial code snippet:

import serial
ser = serial.Serial('/dev/ttyUSB0', 9600)
ser.write('Hello')
ser.close()

AThe close method should be called before write

BThe Serial constructor is missing the timeout parameter

CThe port name '/dev/ttyUSB0' is invalid

DThe write method requires bytes, not a string

Step-by-Step Solution

Solution:

Step 1: Check the write method argument type
pyserial's write() expects bytes, but 'Hello' is a string, causing a TypeError.
Step 2: Verify other parts of the code
Timeout is optional, port name can be valid, and close() should be after write().
Final Answer:
The write method requires bytes, not a string -> Option D
Quick Check:
write() needs bytes, encode strings first [OK]

Quick Trick: Always encode strings to bytes before write() [OK]

Common Mistakes:

MISTAKES

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