Tips from Python Enginner Youtube Channel

11-Tips-And-Tricks-To-Write-Better-Python-Code.py

# 11 Tips And Tricks To Write Better Python Code
## Source: https://www.youtube.com/watch?v=8OKTAedgFYg
## Python Enginner

# 1) Iterate with enumerate() instead of range(len())

data = [1,2,-4,-3]
for i in range(len(data)):
    if data[i] < 0:
        data[i] = 0

print(data)

data = [1,2,-4,-3]
for idx, num in enumerate(data):
    if num < 0:
        data[idx] = 0

print(data)

# 2) Use List of Comprehensions Instead of for raw loops

squares = []
for i in range(10):
    squares.append(i*i)

print(squares)

squares = [i*i for i in range(10)]
print(squares)

# 3) Sort Complex iterables with sorted()

data = [3,5,1,10,9]
sorted_data = sorted(data, reverse=True)
print(sorted_data)

data = [{"name":"Max","age":6},
        {"name":"Lisa","age":20},
        {"name":"Ben","age":9}]

sorted_data = sorted(data, key=lambda x: x["age"])
print(sorted_data)

# 4) Store unique values with sets

my_list = [1,2,3,4,5,6,7,7,7]
my_set = set(my_list)
print(my_set)

primes = {2,3,5,7,11,13,17,19}
print(primes)

# 5) Save Memory with Generators

import sys
my_list = [i for i in range(10000)]
print(sum(my_list))
print(sys.getsizeof(my_list),"bytes")
my_gen = (i for i in range(10000))
print(sum(my_gen))
print(sys.getsizeof(my_gen),"bytes")

# 6) Define defaults values in Dictionaries with .get() and .setdefault()

my_dict = {"item":"footbal","price": "10.00"}
count = my_dict.get("count")
print(count)

count = my_dict.setdefault("count",0)
print(count)
print(my_dict)

# 7) Count hashable objects with collections.Counter
from collections import Counter

my_list = [10,10,10,5,5,2,9,9,9,9,9,9]
counter = Counter(my_list)
most_common = counter.most_common(2)
print(counter)
print(most_common)

# 8) Format string with f-Strings

name = "Estevo"
my_string = f"Hello {name}"
print(my_string)

i = 10
print(f"{i} squared is {i*i}")

# 9) Concat string with .join()

list_of_strings = ["Hello","my","friend"]

#BAD!

my_string = ""
for i in list_of_strings:
    my_string += i + " "
print(my_string)

# GOOD!

my_string = " ".join(list_of_strings)
print(my_string)

# 10) Merge Dictionaries with {**d1,**d2} (3.5+)

d1 = {"name":"Estevo", "age": 26}
d2 = {"name":"Estevo", "city": "Monte Mor"}

merged_dict = {**d1,**d2}

print(merged_dict)

# 11) Simplify if-statement with if x in [a,b,c]

colors = ["red","green","blue"]

c = "red"

#BAD!
if c=="red" or c== "green" or c=="blue":
    print("is main color")

#GOOD!
if c in colors:
    print("is main color")