I'm not able to insert this algorithm into a function
max_trip = 0
for val in trip_duration_list:
if int(val) > max_trip:
max_trip = int(val)
How to create a function to find the largest value in a list?
-3
asked by anonymous 06.12.2018 / 01:26
3 answers
2
def maior_valor(lista):
try:
if len(lista) == 0:
return None
maior = lista[0]
for valor in lista:
if valor > maior:
maior = valor
return maior
except TypeError:
return lista
Considerations:
Due to the dynamic typing of Python, there is no guarantee that the parameter received by the function is of the expected type. The try/catch structure is used to control the program flow if the input is not iterable. When it is, it iterates the object by checking its highest value; when it is not, returns the element itself;
If the input parameter has size 0, it will return None because there are no values to be compared;
The initial value of maior will always be the first element in the list, because this circumvents the problem of starting at 0 but the input list has only negative elements. The highest value in [-1, -2, -3] can not be 0.
Limitations:
Comparing value by value, the list is not allowed to have values of different types, such as [1, '2', (3,)] . This even makes sense, as a way of comparing different types is not natively predicted. If you consider the fact that, generally, but not necessarily, lists are homogeneous, this is no longer a limitation, but for tuples, which are often heterogeneous, you would continue with the problem.
The behavior of the function may be strange when the input is a string , because it will be iterated and the last character will be returned in alphabetical order. That is, maior_valor('anderson') would return 's' ;
Usage:
assert maior_valor([1, 2, 3, 4]) == 4
assert maior_valor([-1, -2, -3]) == -1
assert maior_valor('anderson') == 's'
assert maior_valor(5) == 5
assert maior_valor([]) is None
assert maior_valor('') is None
assert maior_valor([1, '2', (3,)]) == [1, '2', (3,)]
Additional readings:
- What does float ("NaN") and float ("inf") in Python mean?
- Finding the maximum and minimum number in a list in a string
- Get more items in a list array in Python
- convert a string list to a list of integers
- Logic to get the lowest user value read
- A list to receive 20 integers and store in a list and print the largest element in the list
- What is the problem with this code that takes the highest and lowest value?
- In Python, what are the consequences of using 'is' instead of '=='
06.12.2018 / 11:44
1
You can use max() to do this. Example:
list_1, list_2 = [123, 'xyz', 'Rafinha', 'abc'], [325, 600, 199]
print "Max value: ", max(list_1)
print "Max value: ", max(list_2)
#Max value: Rafinha
#Max value: 600
If it is a necessity to create a method for this you just need to include this logic in a method.
06.12.2018 / 01:38
0
First you need to create a function and say that it receives a list as a parameter:
def verificaMaior(trip_duration_list):
Then you need to set an initial value to the variable you want to compare:
max_trip = trip_duration_list[0]
Just after these two basic points you have to go through your list checking if there is any number greater than your comparison variable:
for val in trip_duration_list:
if max_trip < val:
max_trip = int(val)
This is only to return your variable with updated value (the updated value will only be set if there is a larger number in your list):
return max_trip
Complete code:
def verificaMaior(trip_duration_list):
max_trip = trip_duration_list[0];
for val in trip_duration_list:
if max_trip < val :
max_trip = int(val)
return max_trip
print(verificaMaior([1, 2, 3, 4, 10]))
The final print is to show the return of your function in the console.
06.12.2018 / 01:42