Understanding Variables in Python 3.0 for Beginners

USEFUL PYTHON TIPS AND TRICKS

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# Swap two variables with one line of code. Shorten your code

a = 1

b =2

a, b = b, a

# Duplicate strings without looping

fruit_names = "Banana", "Mango"

print (fruit_names * 4)

# Reverse a string

my_words = "The Quick Brown Fox"

reverse_words = my_words[::-1]

print(reverse_words)

# Compress a list of strings into one string

my_words = ["This", "is", "a", "Test"]

combine_all = " ".join(my_words)

print(combine_all)

# You can also compare or evaluate in a line of code

x = 100

res = 0 < x < 1000 > 50

print(res)

# Find the most frequest element in a list

test_list = [4, 3, 2, 3, 2, 4, 3, 6, 9, 41, 2, 3, 4]

most_frequent = max(set(test_list), key = test_list.count)

print(most_frequent)

# Unpack list to separate variables (or assign list to separate varabiels)

arr_list = [1,2,3]

a,b,c = arr_list

print(a,b,c)

# One-liner if-else statements (can be combined with user input!)

my_age = 30

age_group = "Adult" if my_age > 18 else "Child"

print(age_group)

# Loop through a list with one line of code

numbers_list = [1,2,3,4,5]

squared_numbers = [num * num for num in numbers_list]

print(squared_numbers)

# Using dictionary comprehension to raise the value of a dictionary to a

# second power

my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}

squared_dict = {key: num * num for (key, num) in my_dict.items()}

print(squared_dict)

# Simpler If statements

# The original will be something like:

#if n == 0 or n == 1 or n == 2 or n == 3 or n ==4 or n == 5:

# But you can do this instead

n = 10

if n in[0,1,2,4,4,5]:

    print("It is the number I was looking for...")

else:

    print("This is not the number")

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Hope you enjoy these tips!!👴