Is there an elegant way (maybe in numpy) to get a given part of a Python integer, eg say I want to get 90 from 1990.
I can do:
my_integer = 1990 int(str(my_integer)[2:4]) # 90 But it is quite ugly.
Any other option?
- What exactly are you trying to achieve?fuenfundachtzig– fuenfundachtzig2016-04-02 20:43:39 +00:00Commented Apr 2, 2016 at 20:43
- i want to get part of an integer, as explained in my question.tags– tags2016-04-02 20:46:18 +00:00Commented Apr 2, 2016 at 20:46
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4 Answers
1990 % 100 would do the trick.
(% is the modulo operator and returns the remainder of the division, here 1990 = 19*100 + 90.)
Added after answer was accepted:
If you need something generic, try this:
def GetIntegerSlice(i, n, m): # return nth to mth digit of i (as int) l = math.floor(math.log10(i)) + 1 return i / int(pow(10, l - m)) % int(pow(10, m - n + 1)) It will return the nth to mth digit of i (as int), i.e.
>>> GetIntegerSlice(123456, 3, 4) 34 Not sure it's an improvement over your suggestion, but it does not rely on string operations and was fun to write.
(Note: casting to int before doing the division (rather than only casting the result to int in the end) makes it work also for long integers.)
2 Comments
fuenfundachtzig
That's why I asked him.
Bernardo Sulzbach
UpperCamelCase is a terrible naming convention for a Python function, don't show this stuff to beginners and stop writing it. See this PEP8 reference to see what the "standard" is. Even if you don't want to write lowercase with underscores, don't do upper camel case. It is a disgrace (in Python).
Here is generic function for getting any number of last digits:
In [160]: def get_last_digits(num, digits=2): .....: return num%10**digits .....: In [161]: get_last_digits(1999) Out[161]: 99 In [162]: get_last_digits(1999,3) Out[162]: 999 In [166]: get_last_digits(1999,10) Out[166]: 1999 answered Apr 2, 2016 at 20:52
MaxU - stand with Ukraine
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Depends on the use but if you for example know you only want the last two you can use the modulus operator like so: 1990%100 to get 90.
Comments
Maybe like this:
my_integer = 1990 my_integer % 100 