- Installation
- Comment
- Operators
- Conditional structures
- Data types
- map() Function
- filter() Function
- reduce() Function
- zip() Function
- format() function
- Miscellaneous
- Books and other resources
- Bug Reports and Feature Requests
- Author
- License
If you don't want to install python natively you can use docker.
docker run -it --rm python:latest
# check which version of python you're running
python --version
# single line comment
# begin
# multiline
# comment
# end
or
"""
begin
multiline
comment
end
"""
No | operator |
---|---|
1 | and |
2 | or |
3 | not |
4 | && |
5 | || |
6 | ! |
No | operator |
---|---|
1 | & |
2 | | |
3 | ^ |
4 | ~ |
5 | << |
6 | >> |
No | operator |
---|---|
1 | + |
2 | - |
3 | * |
4 | / |
5 | % |
6 | ** |
7 | // |
No | operator |
---|---|
1 | == |
2 | != |
3 | > |
4 | < |
5 | >= |
6 | <= |
7 | <> |
No | operator |
---|---|
1 | = |
2 | += |
3 | -= |
4 | *= |
5 | /= |
6 | %= |
7 | **= |
8 | //= |
x = 11
if x > 10:
print("The number is greater than 10")
else:
print("The number is not greater than 10")
if x == 10:
print('The value of x is 10')
elif x == 11:
print('The value of x is 11')
else:
print('The value of x is not either 10 or 11')
execute_if_true if condition else execute_if_false
print "even" if 6 % 2 == 0 else "odd"
# output
# even
No | Type | Example | Class | Type |
---|---|---|---|---|
1 | int | > a = 17 | > a.__class__.__name__ > 'int' |
Numeric Types |
2 | float | > a = 87.23 | > a.__class__.__name__ > 'float' |
Numeric Types |
3 | complex | > a = 1j or > a = 1J | > `a.class.name`` > 'complex' |
Numeric Types |
4 | str | > a = "Hello universe" | > a.__class__.__name__ > 'str' |
Text Sequence Type |
5 | list | > a = ["a", "b", "c"] | > a.__class__.__name__ > 'list' |
Sequence Types |
6 | tuple | > a = ("a", "b", "c") | > a.__class__.__name__ > 'tuple' |
Sequence Types |
7 | range | > a = range(7) | > a.__class__.__name__ > 'range' |
Sequence Types |
8 | dict | > a = {"name" : "Tom", "age" : 17} | > a.__class__.__name__ > 'dict' |
Mapping Types |
9 | set | > a = {"a", "b", "c"} | > a.__class__.__name__ > 'set' |
Set Types |
10 | frozenset | > a = frozenset({"a", "b", "c"}) | > a.__class__.__name__ > 'frozenset' |
Set Types |
11 | bool | > a = True | > a.__class__.__name__ > 'bool' |
Boolean Types |
12 | bytes | > a = b"Hello universe" | > a.__class__.__name__ > 'bytes' |
Binary Sequence Types |
13 | bytearray | > a = bytearray(7) | > a.__class__.__name__ > 'bytearray' |
Binary Sequence Types |
14 | memoryview | > a = memoryview(bytes(7)) | > a.__class__.__name__ > 'memoryview' |
Binary Sequence Types |
a = 37
isinstance(a, int)
# True
isinstance(a, float)
# False
type(10)
# <type 'int'>
print('Hello World'[0])
# H
print('Hello World'[1])
# e
a = ["a", "b", "c"]
f, s, t = ["a", "b", "c"]
# output
# f = 'a'
# s = 'b'
# t = 'c'
f, *mid, l = ["a", "b", "c"]
# output
# f = 'a'
# mid = ['b']
# l = 'c'
a = ["a", "b", "c"]
b = ["d", "e", "f"]
a.append(b)
# output
# ['a', 'b', 'c', ['d', 'e', 'f']]
a = ["a", "b", "c"]
b = ["d", "e", "f"]
a.extend(b)
# output
# ['a', 'b', 'c', 'd', 'e', 'f']
List slice
list[start_index:stop_index:step]
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
numbers[0::2]
# output
# [1, 3, 5, 7, 9]
numbers[1::2]
# output
# [2, 4, 6, 8, 10]
List Comprehensions
Create a list of lists
[[0]*2 for i in range(2)]
# output
# [[0, 0], [0, 0]]
Create a list of variable length of lists
n = 10
[[0]*(i+1) for i in range(n)] + [[0]*i for i in range(n-1, 0, -1)]
# output
# [[0],
# [0, 0],
# [0, 0, 0],
# [0, 0, 0, 0],
# [0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0, 0],
# [0, 0, 0, 0, 0],
# [0, 0, 0, 0],
# [0, 0, 0],
# [0, 0],
# [0]]
Create a matrix of multiplication tables
n = 5
[[i*j for i in range(1,n+1)] for j in range(1, n+1)]
# output
# [[1, 2, 3, 4, 5],
# [2, 4, 6, 8, 10],
# [3, 6, 9, 12, 15],
# [4, 8, 12, 16, 20],
# [5, 10, 15, 20, 25]]
Dictionary Comprehensions
{c: ord(c) - 96 for c in string.ascii_lowercase[:26]}
# output
# {'a': 1, 'c': 3, 'b': 2, 'e': 5, 'd': 4, 'g': 7, 'f': 6, 'i': 9, 'h': 8, 'k': 11, 'j': 10, 'm': 13, 'l': 12, 'o': 15, 'n': 14, 'q': 17, 'p': 16, 's': 19, 'r': 18, 'u': 21, 't': 20, 'w': 23, 'v': 22, 'y': 25, 'x': 24, 'z': 26}
Set Comprehensions
numbers = [2, 2, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 11, 12, 13, 14]
uniqueEvenNumbers = {num for num in numbers if num % 2 == 0}
# output
# set([2, 4, 6, 8, 10, 12, 14])
uniqueNumbers = set(numbers)
# output
# set([2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14])
map(function, list)
numbers = [1, 2, 3, 4, 5]
squared = list(map(lambda n: n*n, numbers))
# output
# [1, 4, 9, 16, 25]
filter(function, list)
numbers = [1, 2, 3, 4, 5]
odd = list(filter(lambda n: n % 2 != 0, numbers))
# output
# [1, 3, 5]
reduce(function, list)
numbers = [1, 2, 3, 4, 5]
sum = reduce(lambda x, y: x + y, numbers
# output
# 15
Creates an iterator of tuples.
zip(iterator1, iterator2, iterator3 ...)
a = ['a', 'b', 'c']
b = [1, 2, 3]
zip(a, b)
# output
# [('a', 1), ('b', 2), ('c', 3)]
tuples to list
list(map(list, zip(a, b)))
# output
# [['a', 1], ['b', 2], ['c', 3]]
"{:{width}.{prec}f}".format(10.344, width=10, prec=6)
# output
# ' 10.344000'
n.bit_length()
a, b = b, a
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Please create an issue with as much information you can. Thank you.
Mahbub Zaman (https://mahbub.ninja)
MIT License