3 Symbols in Data Science (part 1) (Math & Python)
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1 Name, use and example of =
Equality 5 = 2+3 5 is equal to 2+3
2 Name, use example and equivalent in Python of ≠
Inequality 5 ≠ 4 5 is not equal to 4 In Python: != 3!=4
2.1 Outcome of: print(5!=4)
True
3 Name, use and example of ≈
approximation x ≈ y x is approximately equal to y
4 What does the /= operator mean in Python?
It’s an assignment operator shorthand for / and = x /= 3 # equivalent to x = x / 3
4.1 Outcome of: x = 1 x/=4 x
0.25
5 Name, use and example of >
greater than 5 > 4 5 is greater than 4
5.1 Outcome of: 5>4
True
6 Name, how to read and example of
less than 4 < 5 4 is less than 5
6.1 Outcome of: 5<4
False
7 Name, how to read, example, and equivalent in Python of≥
greater than or equal to 5 ≥ 4, x ≥ y means x is greater than or equal to y Python: 5>=4
Outcome of: a =[0,0] b=[0,1] a>=b
False
8 Name, how to read, example, and equivalent in Python of ≤
less than or equal to 4 ≤ 5, x ≤ y x is less than or equal to y Python: 4<=4
8.1 Outcome of:
a =[0,0] b=[0,1] a<=b
9 Name, use in Maths and Python and examples of: ( )
Parentheses Maths:order of operation. calculate expression inside first Python: order of operation, tuples, generator expressions, function calls and other syntax 2 × (3+5) = 16 a=(1,4,5) #tuple (unchangeable)
9.1 Outcome of: print(2* (3+5) ) print(2*3+5)
16 11
10 Name, use in Maths and Python and examples of:[ ]
Brackets Maths: order of operations.calculates expression inside first Python: order of operation, to define mutable data types - lists, list comprehensions and for indexing/lookup/slicing
10.1 Outcome of: print[2* [3+5] ]
TypeError: ‘builtin_function_or_method’ object is not subscriptable
11 Name and read: + 1 + 1 = 2
Addition One plus one equals two 1 + 1 = 2
12 Name and read: −
Subtraction 2 − 1 = 1 Two minus one equals one
13 Name and example of: ±
plus and minus 3 ± 5 = 8 or -2
14 Name and example of: ± ±
minus - plus both minus and plus operations 3 ∓ 5 = -2 or 8
15 Name,use,read and Python uses of * 2 * 3 = 6
Asterisk Multiplication 2 * 3 = 6 Two multiplied by three is equal to six Python: Multiplication and unpacking
16 Name,use of ⋅
Multiplication dot 2 ⋅ 3 = 6