How to Append a String to a List of Strings Efficiently in Python?

Appending a String to a List of Strings in Python

Appending the same string to each element in a list of strings can be done in several ways, with varying levels of efficiency and code complexity. One common approach involves using a for loop:

<code class="python">list1 = ['foo', 'fob', 'faz', 'funk']
string = 'bar'

list2 = []
for s in list1:
    list2.append(s + string)

print(list2)  # Output: ['foobar', 'fobbar', 'fazbar', 'funkbar']</code>

While this method provides a straightforward solution, it can be verbose and inefficient, especially for large lists. A more concise and performant alternative is offered by list comprehensions:

<code class="python">list2 = [s + string for s in list1]

print(list2)</code>

This approach combines the list and string appending operations into a single line of code. In cases where an iterator is sufficient, a generator expression can be used for increased efficiency:

<code class="python">list2 = (s + string for s in list1)

print(list(list2))</code>

Notably, list comprehensions and generator expressions allow for more complex operations beyond simple appending. They provide great flexibility and code brevity, making them invaluable tools for working with lists in Python.

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