[Solved] What will be the output of this Python code snippet on Raspberry Pi? import serial ser = serial.Serial('/dev/ttyUSB0', baudrate=4800, timeout=2) data = ser.read(5) print(len(data)) | Raspberry Pi

Raspberry Pi - Serial UART Communication

What will be the output of this Python code snippet on Raspberry Pi?

import serial
ser = serial.Serial('/dev/ttyUSB0', baudrate=4800, timeout=2)
data = ser.read(5)
print(len(data))

A5

B0

C2

DRaises an error

Step-by-Step Solution

Solution:

Step 1: Understand ser.read(5) with timeout=2
The read tries to get 5 bytes but waits up to 2 seconds if no data arrives.
Step 2: Consider no data sent to device
If no data is available, read returns empty bytes, so length is 0.
Final Answer:
0 -> Option B
Quick Check:
Timeout causes empty read if no data [OK]

Quick Trick: If no data, read returns empty bytes length 0 [OK]

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