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Leer Built-in functions | Functions
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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))
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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".

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Sectie 7. Hoofdstuk 1
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book
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
Taak

Swipe to start coding

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".

Oplossing

Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 7. Hoofdstuk 1
Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Onze excuses dat er iets mis is gegaan. Wat is er gebeurd?
some-alt