replace() for value substitution in Data Analysis Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace all occurrences of 'cat' with 'dog' in the string.

Data Analysis Python

text = 'The cat sat on the cat mat.'
new_text = text.[1]('cat', 'dog')
print(new_text)

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

Asubstitute

Bswitch

Cchange

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that does not exist like 'substitute' or 'change'.

Forgetting to call the method on the string variable.

The replace() method replaces all occurrences of a substring with another substring in a string.

2fill in blank

medium

Complete the code to replace only the first occurrence of 'apple' with 'orange' in the string.

Data Analysis Python

text = 'apple banana apple grape'
new_text = text.[1]('apple', 'orange', 1)
print(new_text)

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Aswap

Breplace

Cchange

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method that does not accept a count argument.

Not passing the count argument to limit replacements.

The replace() method can take a third argument to limit how many replacements happen. Here, 1 means only the first 'apple' is replaced.

3fill in blank

hard

Fix the error in the code to replace 'blue' with 'red' in the list of colors.

Data Analysis Python

colors = ['blue', 'green', 'blue']
new_colors = [color.[1]('blue', 'red') for color in colors]
print(new_colors)

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Areplace

Bswap

Cchange

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call replace on the list instead of each string.

Using a method name that does not exist.

Strings have the replace() method. We use it inside a list comprehension to replace 'blue' with 'red' in each string.

4fill in blank

hard

Complete the code to create a dictionary with words as keys and their lengths as values, but only for words longer than 3 letters.

Data Analysis Python

words = ['sun', 'moon', 'star', 'sky']
lengths = {word: [1] for word in words if len(word) > 3}
print(lengths)

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A:

Blen(word)

Cword

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of ':' in dictionary comprehension.

Using the word itself as the value instead of its length.

In dictionary comprehension, the key and value are separated by a colon :. The value here is the length of the word using len(word).

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys and their lengths as values, but only for words longer than 3 letters.

Data Analysis Python

words = ['sun', 'moon', 'star', 'sky']
result = { [1]: [2] for word in words if len(word) [3] 3 }
print(result)

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Aword.upper()

Blen(word)

C>

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase instead of uppercase for keys.

Using '<' instead of '>' in the condition.

Mixing up keys and values in the comprehension.

The dictionary comprehension uses word.upper() as keys, len(word) as values, and filters words with length greater than 3 using >.