[Solved] What will be the output of this Python code on Raspberry Pi?with open('log.txt', 'w') as f: f.write('Temp: 22C\n') with open('log.txt', 'a') as f: f.write('Humidity: 60%\n') with open('log.... | Raspberry Pi

Raspberry Pi - Data Logging and Databases

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

with open('log.txt', 'w') as f:
    f.write('Temp: 22C\n')
with open('log.txt', 'a') as f:
    f.write('Humidity: 60%\n')
with open('log.txt', 'r') as f:
    print(f.read())

AError: file not found

BHumidity: 60%

CTemp: 22C

DTemp: 22C Humidity: 60%

Step-by-Step Solution

Solution:

Step 1: Analyze file write modes
First write uses 'w' which creates or overwrites file with 'Temp: 22C\n'.
Step 2: Analyze append and read
Second write uses 'a' to add 'Humidity: 60%\n' without deleting previous data. Reading prints both lines.
Final Answer:
Temp: 22C Humidity: 60% -> Option D
Quick Check:
Write 'w' then append 'a' = both lines [OK]

Quick Trick: Write 'w' clears file, 'a' adds data [OK]

Common Mistakes:

MISTAKES

Assuming 'a' overwrites file
Thinking 'w' appends data
Expecting error when file exists

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

Step 1: Analyze file write modes

Step 2: Analyze append and read

Final Answer:

Quick Check:

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