Built-in Functions in Python
Stryg for at vise menuen
Imagine you have to find the largest number within the list. With what you've learned, you could write a loop that compares each element to the current largest value, updating it when a bigger number is found. Fortunately, Python provides built-in functions that make this task easier and efficient.
For example, if we need to calculate the population density for a set of countries in the countries list, we simply divide the population by the land area.
1234567891011# Initial data countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # Iterating over external list for i in range(len(countries)): if type(countries[i]) is list: # Computing population density for a country pop_dens = countries[i][2]/countries[i][1] print(countries[i][0], pop_dens, 'people per km²')
The list contained five nested sub-lists. A loop iterated through the main list, checking if each item was a list. If so, the population density was calculated by dividing the third item (population) by the second item (area).
1234567891011# Initial data countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # Iterating over external list for i in range(len(countries)): if type(countries[i]) is list: # Computing population density for a country pop_dens = round(countries[i][2]/countries[i][1], 2) print(countries[i][0], pop_dens, 'people per km²')
However, the results were difficult to read due to more than 10 decimal places. To improve readability, you can use the round() function to limit the output to 2 decimal places. This function takes two arguments: the first is the number to be rounded, and the second specifies the number of decimal places to retain.
Tak for dine kommentarer!
Spørg AI
Spørg AI
Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat
Built-in Functions in Python
Imagine you have to find the largest number within the list. With what you've learned, you could write a loop that compares each element to the current largest value, updating it when a bigger number is found. Fortunately, Python provides built-in functions that make this task easier and efficient.
For example, if we need to calculate the population density for a set of countries in the countries list, we simply divide the population by the land area.
1234567891011# Initial data countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # Iterating over external list for i in range(len(countries)): if type(countries[i]) is list: # Computing population density for a country pop_dens = countries[i][2]/countries[i][1] print(countries[i][0], pop_dens, 'people per km²')
The list contained five nested sub-lists. A loop iterated through the main list, checking if each item was a list. If so, the population density was calculated by dividing the third item (population) by the second item (area).
1234567891011# Initial data countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154], ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417], ["India", 3166391, 1380004385]] # Iterating over external list for i in range(len(countries)): if type(countries[i]) is list: # Computing population density for a country pop_dens = round(countries[i][2]/countries[i][1], 2) print(countries[i][0], pop_dens, 'people per km²')
However, the results were difficult to read due to more than 10 decimal places. To improve readability, you can use the round() function to limit the output to 2 decimal places. This function takes two arguments: the first is the number to be rounded, and the second specifies the number of decimal places to retain.
Tak for dine kommentarer!
