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Python CommentsExample 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 TypesText 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 ExamplesExample | Data Type | x = "Color"
| list
| x = 1
| int
| x = 1.2
| float
| x = 2j
| complex
| x = ["Blue","Red","Yellow"]
| list
| x = ("Blue","Red","Yellow")
| tuple
| x = range(8)
| range
| x={"Age":25,"Height":1.72}
| dict
| x = {"Pink","Red"}
| set
| x = frozenset({"Pink","Red"})
| frozenset
| x = True
| bool
| x = b"Color"
| bytes
| x = bytearray(8)
| bytearray
| x = memoryview(bytes(8))
| memoryview
| Get the data type of x : | x = "Color"
print(type(x))
>>> str
|
| | Python CastingCasting 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 StringsOperations 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 StringsReturn 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']
| 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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