CODEWITHSUNDEEP
pythonpython-3.xlist-comprehension
David
David

Reputation: 19

List Comprehension Help: Python

I need help with finding the outcome for the given definitions using python and list comprehension.

firstSentence = ["Help", "me", "stack", "overflow", "you're", "my", "only", "hope"]
secondSentence = ["I", "hope", "you're", "enjoying", "the", "riddles", "I've", "created"]

What's supposed to printed : ['HelpI', 'Helpthe', 'meI', 'stackI', 'stackhope', 'stackthe', "stackI've", 'overflowI', 'overflowhope', "overflowyou're", 'overflowthe', 'overflowriddles', "overflowI've", 'overflowcreated', "you'reI", "you'rehope", "you'rethe", "you'reI've", 'myI', 'onlyI', 'onlythe', 'hopeI', 'hopethe']

I know this one has to do with combinations that has to be less than the secondsentence, but I'm not sure of how to execute that.

Using list comprehension: how do I combine first and second sentence given that the length cannot be more than secondsentence.

Upvotes: 1

Views: 69

Answers (1)

arshovon
arshovon

Reputation: 13661

To get clear grab of list comprehension first let's try to get desired output using nested loop:

firstSentence = ["Help", "me", "stack", "overflow", "you're", "my", "only", "hope"]
secondSentence = ["I", "hope", "you're", "enjoying", "the", "riddles", "I've", "created"]

result = []
for firstWord in firstSentence:
    for secondWord in secondSentence:
        if len(secondWord) < len(firstWord):
            result.append(firstWord+secondWord)
print(result)

Output:

['HelpI', 'Helpthe', 'meI', 'stackI', 'stackhope', 'stackthe', "stackI've", 'overflowI', 'overflowhope', "overflowyou're", 'overflowthe', 'overflowriddles', "overflowI've", 'overflowcreated', "you'reI", "you'rehope", "you'rethe", "you'reI've", 'myI', 'onlyI', 'onlythe', 'hopeI', 'hopethe']

Now let's convert this nested loop with list comprehension:

result = [firstWord+secondWord for firstWord in firstSentence for secondWord in secondSentence if len(secondWord) < len(firstWord)]
print(result)

Output:

['HelpI', 'Helpthe', 'meI', 'stackI', 'stackhope', 'stackthe', "stackI've", 'overflowI', 'overflowhope', "overflowyou're", 'overflowthe', 'overflowriddles', "overflowI've", 'overflowcreated', "you'reI", "you'rehope", "you'rethe", "you'reI've", 'myI', 'onlyI', 'onlythe', 'hopeI', 'hopethe']

N.B.: Variables are not declared or being used as camelCase in Python. It prefers lowercase variable names where words separated by underscore (_).

From Python PEP-8 guideline:

Function names should be lowercase, with words separated by underscores as necessary to improve readability. Variable names follow the same convention as function names.

Reference:

Upvotes: 1

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