Bits of Python Information
List comprehension instead of map and filter
List comprehensions provide a concise way to create lists. List comprehensions are clearer than the map and filter built-in functions because they don't require extra lambda expressions.
# syntax: [expression for item in iterable if conditional]
# instead of using
doubled_numbers = list(map(lambda x: x * 2, range(10)))
# use
doubled_numbers = [x * 2 for x in range(10)]
# both gives the output
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]Do not write Python as C
Developers that have C/C++ background can write python code as C in first times. You should avoid this for writing more readable, faster, and pythonic code.
# instead of writing a loop like
for index in range(len(a_list)):
print(a_list[index])
# write like
for item in a_list:
print(item)
# if you also need the index of item you can use enumerate
for index, item in enumerate(a_list):
print(index, item)Swapping values
In Python, you don't need a temporary variable to swap values. You can do it in one line.
x_val, y_val = y_val, x_val