testing - How can I best assert a value can be converted to int in Python? -

i'm writing tests in python , 1 of tests need verify value either int or can converted int cleanly.

should pass:

0 1 "0" "123456" 

should fail:

"" "x" "1.23" 3.14 

how can best write assertion?

so, 100% sure, must like:

def is_integery(val):     if isinstance(val, (int, long)):  # integer values         return true     elif isinstance(val, float):  # floats can converted without loss         return int(val) == float(val)     elif not isinstance(val, basestring):  # can't convert non-string         return false     else:             try:  # try/except better isdigit, because "-1".isdigit() - false             int(val)         except valueerror:             return false  # someting non-convertible          return true 

in answers below thre check, using type conversions , equality checking, think not work correctly huge integers.

maybe there shorter way