File Operations – Open

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Quick Questions

Shade in the A or B circle for each question.

1. What does open() do?

A Opens a website

B Opens a file for reading or writing

2. What does 'r' mode mean?

A Read only

B Run

3. What does 'w' mode do?

A Writes overwrites existing content

B Reads the file

4. What does 'a' mode do?

A Appends adds to the end

B Reads all

5. Why use 'with open()'?

A It's faster

B Automatically closes the file

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1f = open('data.txt') print(f.read()) f.write('hi')		AOk: Append mode — adds to end
2open('missing.txt', 'r')		BError: FileNotFoundError
3with open('f.txt', 'r') as f: data = f.read()		CValid: with auto-closes file
4open('f.txt', 'a')		DOutput: (writes 'Hi' to file)
5with open('f.txt','w') as f: f.write('Hi')		EError: Can't write in read mode
6f = open('f.txt','r') print(type(f))		FOutput: <class '_io.TextIOWrapper'>

Definitions

open()

Fill in the Blanks

Complete each line of code by filling in the missing parts.

with ____('file.txt', 'r') as f:

with open('file.txt', ___) as f:

with open('file.txt', 'w') __ f:

with open('log.txt', ___) as f: f.write('entry')

f = open('test.txt', 'w') f.write('Hi') f._____()

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A with open('file.txt') as f

B content = f.read()

C print(content)

D print('Done')

Question 2

A with Open('file.txt') as f:

B content = f.read()

C print(content)

D print('Done')

Question 3

A # Open without with block

B f = open('file.txt', 'r')

C content = f.read()

D # forgot to close

Question 4

A with open('file.txt', 'r') as f:

B f.write('Hello')

C print('Written')

D print('Done')

Question 5

A with open(file.txt, 'r') as f:

B content = f.read()

C print(content)

D print('Done')

Answer Key

File Operations – Open

Section A: Quick Questions

B — Opens a file for reading or writing

A — Read only

A — Writes overwrites existing content

A — Appends adds to the end

B — Automatically closes the file

Section B: Match the Pairs

f = open('data.txt') print(f.read()) f.write('hi') → Error: Can't write in read mode

open('missing.txt', 'r') → Error: FileNotFoundError

with open('f.txt', 'r') as f: data = f.read() → Valid: with auto-closes file

open('f.txt', 'a') → Ok: Append mode — adds to end

with open('f.txt','w') as f: f.write('Hi') → Output: (writes 'Hi' to file)

f = open('f.txt','r') print(type(f)) → Output: <class '_io.TextIOWrapper'>

Section C: Definitions

open() — Built-in function that opens a file.~~'r' mode

Section D: Fill in the Blanks

with open('file.txt', 'r') as f:

with open('file.txt', 'w') as f:

with open('log.txt', 'a') as f:
    f.write('entry')

f = open('test.txt', 'w')
f.write('Hi')
f.close()

Section E: Spot the Error

A — Missing colon after the with statement

A — open is lowercase: Open is not valid

B — File is never closed: always close or use 'with'

B — Can't write in 'r' mode: use 'w' or 'a'

A — Filename must be a string in quotes: 'file.txt'