Pythons snippet

01_list_comp.py

list_var = [1, 2, 3]

# Same as list_var2 = list(map(lambda x: x+1, list_var))
list_var2 = [elem + 1 for elem in list_var]

# same as list_var3 = list(filter(lambda x: x!=1, list_var))
list_var3 = [elem for elem in list_var if elem != 1]

02_ds.py

# Tuple, immutable, ordered
a = (1,2,3)

# List, mutable, ordered
b = [1,2,3]

# Set, unordered
c = {1,2,3}

# Dict, key-value pair 
d = {"first": 1, "second": 2}

03_class.py

class A:
  field1: str
  
  def __init__(self, ...):
    """constructor"""
    pass
    
  def __del__(self):
    """Destructor"""
    pass
   
  def method1(self, ...):
    """definition of method"""
    pass

04_error_handling.py

def fn_raising_error_if_val_is_one(val: int):
  """This function will raise error if val is one
  
  Args:
    val: input value
    
  Returns: None
  
  Raises:
    ValueError: if val is one
  """
  if val == 1:
    raise ValueError("input param val shouldn't be one")

try:
  fn_raising_error_if_val_is_one(1)
except ValueError as e:
  print("ValueError is raised")
  print(e)