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Tuple methods in Python - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What does the count() method do in a tuple?
The count() method returns how many times a specific value appears in the tuple.
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beginner
What is the purpose of the index() method in a tuple?
The index() method returns the first position (index) of a specified value in the tuple. If the value is not found, it raises a ValueError.
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beginner
Can you add or remove items from a tuple using tuple methods?
No, tuples are unchangeable (immutable). You cannot add, remove, or change items using tuple methods.
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beginner
Example: What is the output of (1, 2, 3, 2).count(2)?
The output is 2 because the number 2 appears twice in the tuple.
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beginner
Example: What does ("a", "b", "c").index("b") return?
It returns 1 because "b" is at index 1 in the tuple (counting starts at 0).
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Which tuple method tells you how many times a value appears?
Acount()
Bindex()
Cfind()
Dlength()
What does index() return when called on a tuple?
AThe number of times a value appears
BThe length of the tuple
CThe last position of a value
DThe first position of a value
What happens if you try to change a tuple item using a method?
AThe item changes
BAn error occurs
CThe tuple doubles in size
DThe tuple becomes a list
What is the output of (4, 5, 4, 4).count(4)?
A1
B2
C3
D4
If t = ("x", "y", "z"), what does t.index("y") return?
A1
B2
C0
DError
Explain how the count() and index() methods work on tuples.
Think about what each method returns when you look for a value.
You got /3 concepts.
    Why can't you add or remove items from a tuple using methods?
    Consider what 'immutable' means for tuples.
    You got /3 concepts.

      Practice

      (1/5)
      1. Which tuple method tells you how many times a specific value appears in the tuple?
      easy
      A. count()
      B. index()
      C. find()
      D. length()

      Solution

      1. Step 1: Understand tuple methods

        The count() method returns how many times a value appears in a tuple.

      2. Step 2: Compare with other methods

        index() finds the position, find() and length() are not tuple methods.

      3. Final Answer:

        count() -> Option A

      4. Quick Check:

        count() = count occurrences [OK]
      Hint: count() counts occurrences of a value in tuple [OK]
      Common Mistakes:
      • Confusing count() with index()
      • Using find() which is for strings
      • Thinking length() works on tuples
      2. Which of the following is the correct syntax to find the first index of value 5 in tuple t = (1, 5, 3, 5)?
      easy
      A. t.find(5)
      B. t.count(5)
      C. index(t, 5)
      D. t.index(5)

      Solution

      1. Step 1: Recall tuple index method syntax

        The correct syntax is tuple_variable.index(value).

      2. Step 2: Check options

        Only t.index(5) matches the correct syntax.

      3. Final Answer:

        t.index(5) -> Option D

      4. Quick Check:

        tuple.index(value) = correct syntax [OK]
      Hint: Use tuple.index(value) to find first position [OK]
      Common Mistakes:
      • Using count() instead of index()
      • Trying to call find() on tuple
      • Calling index() as a standalone function
      3. What is the output of this code?
      t = (2, 4, 2, 6, 2)
print(t.count(2))
print(t.index(6))
      medium
      A. 2 and 4
      B. 3 and 3
      C. 3 and 4
      D. Error

      Solution

      1. Step 1: Count occurrences of 2 in tuple

        Value 2 appears 3 times in t.

      2. Step 2: Find index of 6 in tuple

        6 is at position 3 (0-based index).

      3. Final Answer:

        3 and 4 -> Option C

      4. Quick Check:

        count(2)=3, index(6)=3 [OK]
      Hint: count() returns total, index() returns first position [OK]
      Common Mistakes:
      • Counting index as 4 instead of 3
      • Mixing count and index results
      • Expecting count to return index
      4. What is wrong with this code?
      t = (1, 2, 3)
print(t.index(4))
      medium
      A. Raises ValueError because 4 is not in tuple
      B. No error, prints -1
      C. SyntaxError due to wrong method
      D. Returns None

      Solution

      1. Step 1: Check if 4 is in tuple

        Value 4 is not present in t.

      2. Step 2: Understand index() behavior when value missing

        index() raises ValueError if value is not found.

      3. Final Answer:

        Raises ValueError because 4 is not in tuple -> Option A

      4. Quick Check:

        index() missing value = ValueError [OK]
      Hint: index() errors if value not found, no -1 return [OK]
      Common Mistakes:
      • Expecting -1 when value not found
      • Thinking index() returns None
      • Confusing with list find() method
      5. Given t = (1, 7, 3, 7, 5), which code finds the index of the second occurrence of 7?
      hard
      A. t.index(7, 1)
      B. t.index(7, t.index(7) + 1)
      C. t.count(7) - 1
      D. t.index(7) + 1

      Solution

      1. Step 1: Find first index of 7

        t.index(7) returns 1, the first occurrence.

      2. Step 2: Use start parameter to find second occurrence

        Calling t.index(7, 2) starts search after first 7, returning index 3.

      3. Step 3: Combine steps in one expression

        t.index(7, t.index(7) + 1) finds second occurrence correctly.

      4. Final Answer:

        t.index(7, t.index(7) + 1) -> Option B

      5. Quick Check:

        Use index(value, start) for next occurrence [OK]
      Hint: Use index(value, start) to find later occurrences [OK]
      Common Mistakes:
      • Using count() instead of index()
      • Not adding 1 to start index
      • Assuming index() returns all positions