Cheatography
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Python Comments
Example 1
#This is a comment |
Example 2
#This is a comment
#written in
#more than just one line |
Example 3
""" This is a comment
written in
more than just one line """ |
Python Variables
x = "How old are you ?" #x is of type str
print(x)
>>> How old are you ?
x = 25 #x now is of type int
print(x)
>>> 25
|
Python Data Types
Text Type: |
str
|
Numeric Types: |
int, float, complex
|
Sequence Types: |
list, tuple, range
|
Mapping Type: |
dict
|
Set Types: |
set, frozenset
|
Boolean Type: |
bool
|
Binary Types: |
bytes, bytearray, memoryview
|
Get the data type of a variable "var" |
type(var)
|
Python Data Types Examples
Example |
Data Type |
x = "Color"
|
list
|
x = 1
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int
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x = 1.2
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float
|
x = 2j
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complex
|
x = ["Blue","Red","Yellow"]
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list
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x = ("Blue","Red","Yellow")
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tuple
|
x = range(8)
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range
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x={"Age":25,"Height":1.72}
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dict
|
x = {"Pink","Red"}
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set
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x = frozenset({"Pink","Red"})
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frozenset
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x = True
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bool
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x = b"Color"
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bytes
|
x = bytearray(8)
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bytearray
|
x = memoryview(bytes(8))
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memoryview
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Get the data type of x : |
x = "Color"
print(type(x))
>>> str
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|
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Python Casting
Casting is used to specify a type on to a variable and this is done using constructor functions.
Examples
x = int(5) #x = 5
x = int(2.8) #x = 2
x = float(5) #x = 5.0
x = float(2.8) #x = 2.8 |
Python Strings
Operations on strings and examples: |
Multiline strings |
x = """ This is a
multiline string"""
|
Get the character at a specific position |
x = "Python Programming"
print(x[1]) #print character at position 1
>>> y
|
Slicing |
x = "Python Programming"
print(x[3:5])
>>> ho
|
Negative Indexing |
x = "Python Programming"
print(x[-15:-13])
>>> ho
|
String Length |
x = "Hello"
print(len(x))
>>> 5
|
Remove any whitespace from the beginning or the end |
x = " Hello "
print(x.strip()) #return "Hello"
|
Return the string in lower case |
x = Hello
print(x.lower()) #return "hello"
|
Python Strings
Return the string in upper case |
x = Hello
print(x.upper()) #return "HELLO"
|
Replace a string with another string |
x = "Hello"
print(x.replace("He","A")) #return "Allo"
|
Choose a separator and split string into substrings |
x = "Python Programming"
print(x.split(" ")) # return ['Python' , 'Programming']
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Check if a string is present in a text |
txt = "Tunisia is a North African country"
x = "North" in txt
print(x) # return True
|
Concatenation |
x = "Hello"
y = "World"
z = x + " " + y
print(z) # return "Hello World"
|
Insert numbers into strings |
quantity = 3
itemno = 567
price = 49.95
myorder = "I want {} pieces of item {} for {} dollars."
print(myorder.format(quantity, itemno, price))
|
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