Using Packing and Unpacking for Efficient Code in Python
The most common usage of packing and unpacking can be seen in the following examples.
Values Swapping
Typically, to swap the values of variables, you might use an additional temporary variable:
a = 2
b = 3
temp = a # temp = 2, a = 2, b = 3
a = b # temp = 2, a = 3, b = 3
b = temp # temp = 2, a = 3, b = 2
Simply put, unpacking enables you to swap values between variables in a more concise manner:
a, b = 2, 3
a, b = b, a # a = 3, b = 2
Dropping Unneeded Values
If you only need the first values from an iterable object, you can pass the unneeded values to the *_ variable.
my_list = ['Monica', 25, 'Doctor', 'Brazil']
name, age, *_ = my_list
Note
We use '_' single underscore for ignoring values: It's common to use _ as a throwaway variable to indicate that a specific value in a tuple unpacking is intentionally being ignored.
1. What is the value of 'c' after it is executed?
2. What does the following code snippet accomplish?
3. What is the result of the following Python code?
Grazie per i tuoi commenti!
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The most common usage of packing and unpacking can be seen in the following examples.
Values Swapping
Typically, to swap the values of variables, you might use an additional temporary variable:
a = 2
b = 3
temp = a # temp = 2, a = 2, b = 3
a = b # temp = 2, a = 3, b = 3
b = temp # temp = 2, a = 3, b = 2
Simply put, unpacking enables you to swap values between variables in a more concise manner:
a, b = 2, 3
a, b = b, a # a = 3, b = 2
Dropping Unneeded Values
If you only need the first values from an iterable object, you can pass the unneeded values to the *_ variable.
my_list = ['Monica', 25, 'Doctor', 'Brazil']
name, age, *_ = my_list
Note
We use '_' single underscore for ignoring values: It's common to use _ as a throwaway variable to indicate that a specific value in a tuple unpacking is intentionally being ignored.
1. What is the value of 'c' after it is executed?
2. What does the following code snippet accomplish?
3. What is the result of the following Python code?
Grazie per i tuoi commenti!
