50 + Python 3 Tips & Tricks
6/29/2020
50+ Python 3 Tips & Tricks - Towards AI--Multidisciplinary Science Journal - Medium
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PROGRAMMING, PYTHON
50+ Python 3 Tips & Tricks
These Python Gems Will Make Your Code Beautiful and Elegant
Eyal Trabelsi Jul 18, 2019 ? 4 min read
Here is a list of python tips and tricks to help you write an elegant Python 3 code! This article is divided into different kinds of tricks:
Python iterable tricks. Python comprehension tricks. Python unpacking tricks. Python itertools tricks.
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Python other tricks.
Python easter eggs.
Python tricks to understand the context.
Python Iterables tricks
Creating a sequence of numbers (zero to ten with skips).
1 >>> range(0,10,2) 2 [0, 2, 4, 6, 8] 3
python-tricks_iterables_1.py hosted with by GitHub
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Summing a sequence of numbers (calculating the sum of zero to ten with skips).
1 >>> l = range(0,10,2) 2 >>> sum(l) 3 20
python-tricks_iterables_2.py hosted with by GitHub
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Checking whether any element in the sequence is Truthful (checking whether any elements between zero and ten with skips are even).
1 >>> any(a % 2==0 for a in range(0,10,2)) 2 True
python-tricks_iterables_3.py hosted with by GitHub
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Checking whether all elements in the sequence are Truthful (checking whether all elements between zero and ten with skips are even).
1 2 >>> all(a % 2==0 for a in range(0,10,2)) 3 True
python-tricks_iterables_4.py hosted with by GitHub
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50+ Python 3 Tips & Tricks - Towards AI--Multidisciplinary Science Journal - Medium
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1 >>> import numpy as np 2 >>> res = list(np.cumsum(range(0,10,2))) 3 >>> res 4 [ 0, 2, 6, 12, 20]
python-tricks_iterables_5.py hosted with by GitHub
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Given each iterable we construct a tuple by adding an index.
1 >>> a = ['Hello', 'world', '!'] 2 >>> list(enumerate(a)) 3 [(0, 'Hello'), (1, 'world'), (2, '!')]
python-tricks_iterables_3.py hosted with by GitHub
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Concatenating iterable to a single string.
1 >>> a = ["python","really", "rocks"] 2 >>> " ".join(a) 3 'python really rocks'
python-tricks_iterables_5.py hosted with by GitHub
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Combining two iterable of tuples or pivot nested iterables.
1 # Combining two iterables 2 >>> a = [1, 2, 3] 3 >>> b = ['a', 'b', 'c'] 4 >>> z = zip(a, b) 5 >>> z 6 [(1, 'a'), (2, 'b'), (3, 'c')] 7 8 # Pivoting list of tuples 9 >>> zip(*z) 10 [(1, 2, 3), ('a', 'b', 'c')]
python-tricks_comprehension_6.py hosted with by GitHub
Getting min/max from iterable (with/without specific function).
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1 # Getting maximum from iterable
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42 5 6 # Getting maximum from iterable 7 >>> min(a) 81 9 10 # Bot min/max has key value to allow to get maximum by appliing function 11 >>> max(a,key=abs) 12 3
python-tricks_iterables_7.py hosted with by GitHub
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Getting sorted iterable (can sort by "compare" function).
1 >>> a = [1, 2, -3] 2 >>> sorted(a) 3 [-3, 1, 2] 4 5 >>> sorted(a,key=abs) 6 [1, 2, -3]
python-tricks_iterables_8.py hosted with by GitHub
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Splitting a single string to list.
1 >>> s = "a,b,c" 2 >>> s.split(",") 3 ["a", "b", "c"]
python-tricks_iterables_9.py hosted with by GitHub
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Initializing a list filled with some repetitive number.
1 >> [1]* 10 2 [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
python-tricks_iterables_10.py hosted with by GitHub
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Merging/Upserting two dictionaries.
1 >>> a = {"a":1, "b":1}
2 >>> b = {"b":2, "c":1}
3 >>> a.update(b)
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python-tricks_iterables_11.py hosted with by GitHub
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Naming and saving slices of iterables.
1 2 # Naming slices (slice(start, end, step)) 3 >>> a = [0, 1, 2, 3, 4, 5] 4 >>> LASTTHREE = slice(-3, None) 5 >>> LASTTHREE 6 slice(-3, None, None) 7 >>> a[LASTTHREE] 8 [3, 4, 5]
python-tricks_iterables_13.py hosted with by GitHub
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Finding the index of an item in a list.
1 >>> a = ["foo", "bar", "baz"] 2 >>> a.index("bar") 31
python-tricks_iterables_14.py hosted with by GitHub
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Finding the index of the min/max item in an iterable.
1 >>> a = [2, 3, 1] 2 >>> min(enumerate(a),key=lambda x: x[1])[0] 32
python-tricks_iterables_15.py hosted with by GitHub
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Rotating iterable by k elements.
1 >>> a = [1, 2, 3, 4] 2 >>> k = 2 3 >>> a[-2:] + a[:-2] 4 [3, 4, 1, 2]
python-tricks_iterables_16.py hosted with by GitHub
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Removing useless characters on the end/start/both of your string.
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