Plain text (TXT) files: structure
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which statement best describes a plain text (TXT) file?
2. How does a TXT file usually mark the end of each line of text?
3. A TXT file contains the line 42. In Python, what type is the value after reading it with readline()?
4. Which is true about field headings in a plain TXT file?
5. A program reads the line 15 from scores.txt and needs to add 5 to it. Which code is correct?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Ava\nLiam\nMia | AA TXT file has no fields or data types, so it cannot store typed fields with headings. It only holds plain characters, usually one line per item. | |
| 2line = file.readline() # reads 88 | Bmark = int(file.readline()) | |
| 3A TXT file has no field headings, so the file does not label what each line means | CAva\n88\nLiam\n65 | |
| 4Because everything in a TXT file is read as a string, a number must be converted before it is used in a calculation | DA TXT file where each line holds one item, and the end of each line is marked by a newline character | |
| 5total = file.readline() + 10 | EThe line read from a TXT file is a string, so adding the integer 10 causes a type error. Convert it with int() first. | |
| 6Name: Ava, Mark: 88 stored in a TXT file as typed fields | FThe value read from a TXT file is the string '88', not the integer 88 |
C
Definitions
TXT file
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
f = open("names.txt", "w")
f.write("Ava__")
2.
line = f.readline()
age = ___(line)
3.
f = open("names.txt")
lines = f._________()
4.
line = f.readline()
name = line._____()
5.
line = f.readline()
print(type(line) == ___)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
f = open("scores.txt")
B
line = f.readline()
C
total = line + 5
D
print(total)
E
f.close()
Question 2
A
f = open("names.txt", "r")
B
names = f.readlines
C
print(len(names))
D
f.close()
Question 3
A
with open("notes.txt") as f
B
text = f.read()
C
print(text)
Question 4
A
f = open("log.txt", "w")
B
f.write("Login ok/n")
C
f.write("Logout\n")
D
f.close()
Question 5
A
f = open("names.txt")
B
for line in f:
C
name = line.trim()
D
print("Hi " + name)
Answer Key
Plain text (TXT) files: structure
Section A: Quick Questions
Q1
A — It stores unformatted characters, usually one item per line
Q2
B — A newline character
Q3
B — A string
Q4
A — There are no built-in field headings
Q5
A — total = int(line) + 5
Section B: Match the Pairs
Q1
Ava\nLiam\nMia → A TXT file where each line holds one item, and the end of each line is marked by a newline character
Q2
line = file.readline() # reads 88 → The value read from a TXT file is the string '88', not the integer 88
Q3
A TXT file has no field headings, so the file does not label what each line means → Ava\n88\nLiam\n65
Q4
Because everything in a TXT file is read as a string, a number must be converted before it is used in a calculation → mark = int(file.readline())
Q5
total = file.readline() + 10 → The line read from a TXT file is a string, so adding the integer 10 causes a type error. Convert it with int() first.
Q6
Name: Ava, Mark: 88 stored in a TXT file as typed fields → A TXT file has no fields or data types, so it cannot store typed fields with headings. It only holds plain characters, usually one line per item.
Section C: Definitions
Q1
TXT file — A plain text file holds unformatted characters, usually one line of text per line ended by a newline. It has no field headings or data types, so everything is read as a string.Section D: Fill in the Blanks
Q1
f = open("names.txt", "w")
f.write("Ava\n")Q2
line = f.readline()
age = int(line)Q3
f = open("names.txt")
lines = f.readlines()Q4
line = f.readline()
name = line.strip()Q5
line = f.readline()
print(type(line) == str)Section E: Spot the Error
Q1
C — Everything read from a text file is a string, so line + 5 mixes a string and an integer and causes a TypeError. Convert it first: total = int(line) + 5.
Q2
B — readlines needs brackets to be called. Without them names holds the method itself, not the list of lines. It should be names = f.readlines().
Q3
A — A with statement must end with a colon so the indented block below it belongs to it. It should be with open("notes.txt") as f:
Q4
B — A newline character is written \n with a backslash, not /n. With /n the text ends in the characters /n instead of ending the line. It should be f.write("Login ok\n").
Q5
C — Python strings have no trim() method. Use strip() to remove the newline at the end of each line. It should be name = line.strip().