Python Iterating Multiple Lists Professionally
Iterating over multiple lists professionally in Python means using efficient and elegant ways to loop over two or more lists at the same time. There are different methods to achieve this, depending on your needs and preferences.
One common method is to use the built-in zip() function, which takes two or more iterables (such as lists) and returns an iterator of tuples, where each tuple contains one element from each iterable. For example, if you have two lists L1 = [1, 2, 3] and L2 = [‘a’, ‘b’, ‘c’], you can write for x, y in zip(L1, L2): to iterate over both lists simultaneously. The zip() function stops when the shortest iterable is exhausted.
Another method is to use the itertools module, which provides various functions for working with iterators. For example, you can use itertools.chain() to concatenate multiple iterables into one long iterable, or itertools.cycle() to repeat an iterable indefinitely. You can also use itertools.zip_longest() (or itertools.izip_longest() in Python 2) to iterate over multiple iterables of different lengths and fill the missing values with a default value.
A third method is to use list comprehensions, which are concise and expressive ways to create new lists from existing iterables. For example, you can write [x + y for x, y in zip(L1, L2)] to create a new list by adding corresponding elements from two lists. You can also use nested list comprehensions to iterate over multiple dimensions of data.
Most of the time when you scrape data from the web, you store it in a different list. This hack lets you print each element of the list corresponding to each element of another list.
Writers =['J. K. Rowling', 'Albert Einstein']
Sayings = ['"It is our choices, Harry, that show what we truly are, far more than our abilities."','"Try not to become a man of success, rather become a man of value."']
data = zip(Writers, Sayings)
for writer, saying in list(data):
print(saying, " by ", writer, end="\n")
# output
# "It is our choices, Harry, that show what we truly are, far more than our abilities." by J. K. Rowling
# "Try not to become a man of success, rather become a man of value." by Albert Einstein
If you have any questions about this code, you can drop a line in comment.
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