Python上元组与int的比较

Question

我正在训练比较Python中元组的组件，以找到最大和最小的组件，但是我的代码只返回两个最新组件，我不知道为什么：

numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"
numbers2=numbers.split()
numbers2=tuple(numbers2)
i=0
gran=numbers2[0]
petit=numbers2[0]
for i in range (len(numbers2)):
    if numbers2[i]>gran:
    gran=numbers2[i]
print(gran)
j=0
for j in range (len(numbers2)):
    if numbers[j]<petit:
    petit=numbers2[j]
print(petit)
resultat= gran+" "+petit
print(resultat)

我得到了“6-6”作为回报。有什么帮助吗？谢谢

Answer 1

在将拆分的字符串转换为元组之前，将其转换为整数。

numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"
numbers2=[int(x) for x in numbers.split()]
numbers2=tuple(numbers2)
...

还可以将这两个操作合并为一行。

numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"
numbers2=tuple([int(x) for x in numbers.split()])
...

Answer 2

其他人已经提到，这些项需要转换为整数。我还想提到有可用的min和max函数。

>>> numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"
>>> numbers_tuple=tuple(int(i) for i in numbers.split())
>>> min(numbers_tuple)
-214
>>> max(numbers_tuple)
542

这也避免了像前面的许多答案一样创建初始列表，但是在tuple()实例化中使用生成器表达式，而不是使用列表理解。

Answer 3

元组是字符串的元组，而不是整数的元组。您需要将元组转换为整数元组：

numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"
numbers2=numbers.split()
numbers2 = [int(i) for i in numbers2] # convert tuple of strs to tuple of ints

全面工作计划：

numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"
numbers2=numbers.split()
numbers2 = [int(i) for i in numbers2] # convert tuple of strs to tuple of ints
numbers2=tuple(numbers2)
i=0
gran=numbers2[0]
petit=numbers2[0]
for i in range (len(numbers2)):
    if numbers2[i]>gran:
        gran=numbers2[i]
print(gran)
j=0
for j in range (len(numbers2)):
    if numbers2[j]<petit:
        petit=numbers2[j]
print(petit)
resultat= str(gran)+" "+str(petit)
print(resultat)

输出：

542
-214
542 -214
>>> 

我要指出的是，您的程序可以编写得比现在的要简单得多：

numbers="4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"

# convert the numbers string to a tuple of integers
num_lst = tuple([int(i) for i in numbers.split()])

# take a guess and say the
# highest and lowest are both
# the first element in num_lst
lowest = num_lst[0]
highest = num_lst[0]

# iterate through the
# num_lst. No need to
# initizalize i beforehand
for i in num_lst:
    # if we find a higher number
    # then our guess of the highest
    # number, reassign highest to that number
    if i > highest:
        highest = i
    # if we find a lower number
    # then our guess of the lowest
    # number, reassign lowest to that number
    elif i < lowest:
        lowest = i

# print the highest and lowest number
print("Highest:", highest, " Lowest:", lowest)