139 lines
4.2 KiB
Python
139 lines
4.2 KiB
Python
# string
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a, b, c = "123" # a = "1", b = "2", c ="3"
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# list
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a, b, c = [1, 2, 3] # a = 1, b = 2, c = 3
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# range
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a, b, c = range(3) # a = 0, b = 1, c = 2
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# set
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a, b, c = {1, 2, 3} # a = 1, b = 2, c = 3
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a, b, c = {3, 2, 1} # a = 1, b = 2, c = 3
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# dict
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dict_num = {"one": 1, "two": 2, "three": 3}
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a, b, c = dict_num # a = "one", b = "two", c = "three"
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a, b, c = dict_num.values() # a = 1, b = 2, c = 3
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a, b, c = dict_num.items() # a = ("one", 1), b = ("two", 2), c = ("three", 3)
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# assignment to the list
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[a, b, c] = 1, 2, 3 # a = 1, b = 2, c = 3
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[a, b, c] = "123" # a = "1", b = "2", c ="3"
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# Examples:
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my_tuple = ("Anna", 27, "Python Developer")
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name, age, career = my_tuple
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print(name, age, career)
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# Using starred variables
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# *a, *b = 1, 2, 3, 4 # Error: Only one starred expression is allowed
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a, *b = 1, 2, 3, 4 # a = 1, b = [2, 3, 4]
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print(a, b)
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# *a, *b, *c = 1, 2, 3 # Error: Only one starred expression is allowed
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# Practice
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# Unpacking a tuple
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my_tuple = (1, 2, 3)
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a, b, c = my_tuple # a = 1, b = 2, c = 3
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print(a, b, c)
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# Unpacking a list
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my_list = [4, 5, 6]
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d, e, f = my_list # d = 4, e = 5, f = 6
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print(d, e, f)
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# Unpacking a string
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my_string = "abc"
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x, y, z = my_string # x = "a", y = "b", z = "c"
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print(x, y, z)
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# Unpacking a set
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my_set = {7, 8, 9}
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a, b, c = my_set # a = 7, b = 8, c = 9
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print(a, b, c)
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# Unpacking a dictionary values
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my_dict = {"name": "John", "age": 30, "city": "New York"}
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name, age, city = my_dict.values()
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print(name, age, city)
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# Unpacking a dictionary items
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my_dict = {"name": "John", "age": 30, "city": "New York"}
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name, age, city = my_dict.items() # name = ("name", "John"), age = ("age", 30), city = ("city", "New York")
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print(name, age, city)
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# Unpacking a dictionary vaules into a list
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name_list = [name[1], age[1], city[1]]
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print(name_list)
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# Unpacking a dictionary values into a list using list comprehension
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name_list = [name[1] for name in my_dict.items()] # Extracting names from the dictionary items
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print(name_list)
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# Unpacking a dictionary items into a list
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item_list = [item for item in my_dict.items()]
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print(item_list)
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my_list = list(my_dict.items()) # Converting dictionary items to a list of tuples
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print(my_list)
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my_list = list(my_dict.values()) # Converting dictionary values to a list
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print(my_list)
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# Dropping unneeded variables
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# Unpacking with an underscore to ignore variables
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my_tuple = (1, 2, 3, 4)
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a, b, _, d = my_tuple # a = 1, b = 2, d = 4
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print(a, b, d)
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# Unpacking with an underscore to ignore variables in a list
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my_list = [5, 6, 7, 8]
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e, f, _, g = my_list # e = 5, f = 6, g = 8
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print(e, f, g)
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# Unpacking with an underscore to ignore variables in a string
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my_string = "xyz"
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x, y, _ = my_string # x = "x", y = "y"
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print(x, y)
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# Unpacking with an underscore to ignore variables in a set
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my_set = {10, 11, 12}
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a, b, _ = my_set # a = 10, b = 11
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print(a, b)
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# Unpacking with an underscore to ignore variables in a dictionary
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my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}
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key1, key2, _ = my_dict # key1 = "key1", key2 = "key2"
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print(key1, key2)
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# Unpacking with an underscore to ignore variables in a dictionary values
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my_dict = {"name": "Alice", "age": 25, "city": "Wonderland"}
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name, age, _ = my_dict.values() # name = "Alice", age = 25
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print(name, age)
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# Unpacking with an underscore to ignore variables in a dictionary items
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my_dict = {"name": "Bob", "age": 30, "city": "Atlantis"}
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name, age, _ = my_dict.items() # name = ("name", "Bob"), age = ("age", 30)
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print(name, age)
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# Using unpacking to create a new dictionary from an existing one
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my_dict = {"name": "Bob", "age": 30, "city": "Atlantis"}
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name, age, _ = my_dict.items() # name = ("name", "Bob"), age = ("age", 30) tuple
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my_new_dict = {name[0]: name[1], age[0]: age[1]} # Creating a new dictionary
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print(my_new_dict)
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# Using unpacking to create a new dictionary from an existing one using dict
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my_dict = {"name": "Bob", "age": 30, "city": "Atlantis"}
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name, age, _ = my_dict.items() # name = ("name", "Bob"), age = ("age", 30) tuple
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my_new_dict = dict(name=name[1], age=age[1]) # Creating a new dictionary
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print(my_new_dict)
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a, *b, c = 1, 2, 3, 4, 5 # a = 1, b = [2, 3, 4], c = 5
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print(a, b, c)
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a, _, b, *_ = 1, 2, 3, 4, 5 # a = 1, b = 2, _ = 3, *_ = [4, 5]
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print(f"a={a}, b={b}")
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