For and while loops in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to loop through the numbers 1 to 5 and print each number.

Blockchain / Solidity

for i in range(1, [1]):
    print(i)

Drag options to blanks, or click blank then click option'

A6

B5

C4

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 5 as the end number, which excludes 5 from the loop.

The range function stops before the end number, so to include 5, we use 6.

2fill in blank

medium

Complete the code to create a while loop that stops when the variable count reaches 3.

Blockchain / Solidity

count = 0
while count [1] 3:
    print(count)
    count += 1

Drag options to blanks, or click blank then click option'

A>

B<

C==

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which causes an infinite loop or no loop at all.

The loop should continue while count is less than 3.

3fill in blank

hard

Fix the error in the for loop to correctly print each item in the list.

Blockchain / Solidity

items = ['block', 'chain', 'loop']
for [1] in items:
    print(item)

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Aitem

Bi

Cblock

Dchain

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name than in the print statement.

The loop variable should be item to match the print statement.

4fill in blank

hard

Fill both blanks to create a dictionary with words as keys and their lengths as values, but only for words longer than 4 letters.

Blockchain / Solidity

lengths = {word: [1] for word in words if len(word) [2] 4}

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Alen(word)

B<

C>

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' which selects shorter words.

We want the length of each word as the value, and only words longer than 4 letters.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values only if the value is greater than 10.

Blockchain / Solidity

result = [1]: [2] for k, v in data.items() if v [3] 10}

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Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using the key directly without uppercase.

Using '<' instead of '>' for filtering.

Keys are uppercase using k.upper(), values are v, and we filter values greater than 10.