103 lines
1.8 KiB
Markdown
103 lines
1.8 KiB
Markdown
# Python Cheat Sheet
|
|
|
|
## Variables and Data Types
|
|
|
|
### Variables
|
|
# Declaring a variable
|
|
x = 5
|
|
# Reassigning a variable
|
|
x = 10
|
|
|
|
### Data Types
|
|
# Integer
|
|
x = 5
|
|
# Float
|
|
x = 5.0
|
|
# Boolean
|
|
x = True
|
|
# String
|
|
x = "Hello, World!"
|
|
|
|
## Operators
|
|
# Arithmetic Operators
|
|
+, -, *, /, %, **
|
|
# Comparison Operators
|
|
==, !=, >, <, >=, <=
|
|
# Logical Operators
|
|
and, or, not
|
|
|
|
## Control Structures
|
|
|
|
### Conditional Statements
|
|
# If statement
|
|
if x > 5:
|
|
print("x is greater than 5")
|
|
elif x == 5:
|
|
print("x is equal to 5")
|
|
else:
|
|
print("x is less than 5")
|
|
|
|
### Loops
|
|
# For loop
|
|
for i in range(0, 5):
|
|
print(i)
|
|
# While loop
|
|
i = 0
|
|
while i < 5:
|
|
print(i)
|
|
i += 1
|
|
|
|
## Functions
|
|
# Defining a function
|
|
def my_function(param1, param2):
|
|
print(param1 + param2)
|
|
# Calling a function
|
|
my_function(5, 10)
|
|
|
|
## Lists
|
|
# Declaring a list
|
|
my_list = [1, 2, 3, 4, 5]
|
|
# Accessing elements of a list
|
|
my_list[0] # returns 1
|
|
my_list[-1] # returns 5
|
|
# Slicing a list
|
|
my_list[1:3] # returns [2, 3]
|
|
# Appending to a list
|
|
my_list.append(6)
|
|
# Removing from a list
|
|
my_list.remove(2)
|
|
|
|
## Dictionaries
|
|
# Declaring a dictionary
|
|
my_dict = {"key1": "value1", "key2": "value2"}
|
|
# Accessing elements of a dictionary
|
|
my_dict["key1"] # returns "value1"
|
|
# Adding to a dictionary
|
|
my_dict["key3"] = "value3"
|
|
# Removing from a dictionary
|
|
del my_dict["key2"]
|
|
|
|
## Classes
|
|
# Declaring a class
|
|
class MyClass:
|
|
def __init__(self, param1, param2):
|
|
self.param1 = param1
|
|
self.param2 = param2
|
|
|
|
def my_method(self):
|
|
print(self.param1 + self.param2)
|
|
# Creating an instance of a class
|
|
my_instance = MyClass(5, 10)
|
|
# Calling a method of a class
|
|
my_instance.my_method()
|
|
|
|
## Exceptions
|
|
# Catching an exception
|
|
try:
|
|
# some code that may raise an exception
|
|
except ExceptionType:
|
|
# do something to handle the exception
|
|
# Raising an exception
|
|
raise ExceptionType("Error message")
|
|
|