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Built-in functions | Functions
Learn Python from Scratch
course content

Course Content

Learn Python from Scratch

Learn Python from Scratch

1. The basics
2. Arithmetic operations
3. Common data types
4. Conditional statements
5. Other data types
6. Loops
7. Functions

Built-in functions

What if I ask you to define the maximum number in the list? Surely, using acquired knowledge, you can write a loop and check if the current element is greater/less than the previous and rewrite it, otherwise - continue... But in the case of big lists, this approach is very time-harmful... This task can be solved by using some built-in function.

  • min(x, y, ...) - minimum element of x, y, ...
  • max(x, y, ...) - maximum element of x, y, ...
  • abs(x) - absolute value of number
  • round(x, n) - rounds number x to n digits
  • pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits

1234567
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # calculate population density for countries for i in range(len(countries)): if type(countries[i]) is list: print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))
copy

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 7. Chapter 1
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Built-in functions

What if I ask you to define the maximum number in the list? Surely, using acquired knowledge, you can write a loop and check if the current element is greater/less than the previous and rewrite it, otherwise - continue... But in the case of big lists, this approach is very time-harmful... This task can be solved by using some built-in function.

  • min(x, y, ...) - minimum element of x, y, ...
  • max(x, y, ...) - maximum element of x, y, ...
  • abs(x) - absolute value of number
  • round(x, n) - rounds number x to n digits
  • pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits

1234567
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # calculate population density for countries for i in range(len(countries)): if type(countries[i]) is list: print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))
copy

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 7. Chapter 1
toggle bottom row

Built-in functions

What if I ask you to define the maximum number in the list? Surely, using acquired knowledge, you can write a loop and check if the current element is greater/less than the previous and rewrite it, otherwise - continue... But in the case of big lists, this approach is very time-harmful... This task can be solved by using some built-in function.

  • min(x, y, ...) - minimum element of x, y, ...
  • max(x, y, ...) - maximum element of x, y, ...
  • abs(x) - absolute value of number
  • round(x, n) - rounds number x to n digits
  • pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits

1234567
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # calculate population density for countries for i in range(len(countries)): if type(countries[i]) is list: print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))
copy

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

What if I ask you to define the maximum number in the list? Surely, using acquired knowledge, you can write a loop and check if the current element is greater/less than the previous and rewrite it, otherwise - continue... But in the case of big lists, this approach is very time-harmful... This task can be solved by using some built-in function.

  • min(x, y, ...) - minimum element of x, y, ...
  • max(x, y, ...) - maximum element of x, y, ...
  • abs(x) - absolute value of number
  • round(x, n) - rounds number x to n digits
  • pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits

1234567
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # calculate population density for countries for i in range(len(countries)): if type(countries[i]) is list: print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))
copy

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below
Section 7. Chapter 1
Switch to desktop for real-world practiceContinue from where you are using one of the options below
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