Python for Business Analytics (Part 1) Cheat Sheet

A Programming › Python cheat sheet in English by ocivv

Python for Business Analytics

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PRs

Data Type

Integer	-100, 0, -100
Float	-100.98, 0.0001, 90.00
String	'Python', '400', '100+200', 'True'
Boolean	True, False

Operators

Numeric		Comparison
+	Addition	==	Equal
-	Subtraction	!=	Different
*	Multplication	>	Higher
/	Division	<	Lower
**	Exponent	>=	Higher or Equal
%	Modulus	<=	Lower or Equal
//	Floor Division

Boolean		String
&	Logical AND	+	Concatenation
\|	Logical OR
not	Logical NOT

Assignment Statement & Expression

Expression is a combination of values, variables, and operators
222	'text'
25+36	'App' + 'le'
Assignment Statement links a variable name on the left hand side of the operator, with an expression on the right hand side.
a = 222	b = 'text'
c = 25 +36	d = 'App' + 'le'
a = a + 1

List Operations

Create a List	L1 = [1, 2, 3, 4, 5, 6]
Get the first element	L1[0]
Get the last element	L1[-1]
Count List elements	len()
Insert an element	insert()
Insert an element to the end	append()
Sort all elements	sort()
Remove an element	pop()
Convert object to List	list()

Slicing

Slicing Expression
List Name[start index : stop index : step size]
(Step size is optional)
Examples
2nd - 5th elements	L1[1:5]
2nd - Last elements	L1[1:]
1st - 3rd elements	L1[0:3]
All alternate elements	L1[::2]

Dictionary (Dict.) Operations

Create a Dict.	D1 = {"Andrew":18, "Johnson":23, "Olivia":22}
Create a Dict. from two Lists	dict(zip())
Access Dict. value	D1["Andrew"]
Update Dict. value	D1["Andrew"] = 20
Add an element	D1["Sue"] = 25
Drop an element	del D1["Johnson"]
Count Dict. elements	len()
Return all keys	keys()
Return all values	values()

Tuple Operations

Create a Tuple	T1 = (1, 2, 3, 4, 5, 6)
Convert List to Tuple	tuple()
Note: Tuple elements are immutable and cannot be changed via operations.

Set Operations

Create a Set	S1 = {1, 2, 3, 4, 5}
Insert an element	add()
Find unique elements	set()
Create a Set with all elements from 2 Sets	union()
Create a Set with common elements from 2 Sets	intersection()

List Comprehension

newlist = [expression for variable in sequence if condition]

Conditional Statements

if Condition 1:
    Code Block 1
elif Condition 2:
    Code Block 2
elif Condition 3:
    Code Block 3
else: 
    Code Block 4

for Loops

for <variable> in <sequence>:
    Code Block

Example:
for x in range(0,5):
    print(x)

while Loops

while <expression>:
    Code Block

Example:
i = 2
while i <= 10:
    print(i)
    i = i + 3

Nested loop

for iterating_var in sequence:
    for iterating_var in sequence:
        Code Block1
    Code Block2

while <expression>:
    while <expression>:
        Code Block1
    Code Block2

Statements used with Loops

break	Terminate the whole loop
continue	Stop the current iteration of the loop, and continue with the next. Loop does not terminate.
pass	Do nothing and continue the rest of the code inside a loop for the current iteration

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