Make individual array values to single number in P

问题:

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Closed 4 years ago.

I am having one array like below.

a = [1,2,3,4]

I want to make this array to single value like this:

a = [1234]

How can I do this in Python?

回答1:

You can use join to join all element in array, but you have to convert them to a string first:

>>> a = [1,2,3,4]
>>> [int(''.join([str(i) for i in a]))]
[1234]

回答2:

you can do it without converting each element to string.

>>> def sum_elements(arr):
...     s = 0
...     for e in arr:
...         s *= 10
...         s += e
...     return s
... 
>>> a = [1, 2, 3, 4]
>>> a = [sum_elements(a)]
>>> a
[1234]
>>>  

回答3:

You can loop for all elements of a and add the digit multiplied by a power of 10 to reach the good value.

a = [1,2,3,4]
b = [0]
for i in xrange(len(a)):
    b[0]+= (10**(len(a)-i-1))*a[i]
print a, b

[1, 2, 3, 4] [1234]