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July 8, 2020 03:43
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Tips from Python Enginner Youtube Channel
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| # 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") |
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