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120 lines
3.8 KiB
Python
120 lines
3.8 KiB
Python
import sys
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import test_support
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def powtest(type):
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if type != float:
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print " Testing 2-argument pow() function..."
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for i in range(-1000, 1000):
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if pow(type(i), 0) != 1:
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raise ValueError, 'pow('+str(i)+',0) != 1'
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if pow(type(i), 1) != type(i):
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raise ValueError, 'pow('+str(i)+',1) != '+str(i)
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if pow(type(0), 1) != type(0):
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raise ValueError, 'pow(0,'+str(i)+') != 0'
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if pow(type(1), 1) != type(1):
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raise ValueError, 'pow(1,'+str(i)+') != 1'
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for i in range(-100, 100):
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if pow(type(i), 3) != i*i*i:
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raise ValueError, 'pow('+str(i)+',3) != '+str(i*i*i)
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pow2 = 1
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for i in range(0,31):
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if pow(2, i) != pow2:
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raise ValueError, 'pow(2,'+str(i)+') != '+str(pow2)
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if i != 30 : pow2 = pow2*2
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for othertype in int, long:
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for i in range(-10, 0) + range(1, 10):
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ii = type(i)
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for j in range(1, 11):
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jj = -othertype(j)
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try:
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pow(ii, jj)
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except ValueError:
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raise ValueError, "pow(%s, %s) failed" % (ii, jj)
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for othertype in int, long, float:
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for i in range(1, 100):
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zero = type(0)
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exp = -othertype(i/10.0)
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if exp == 0:
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continue
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try:
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pow(zero, exp)
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except ZeroDivisionError:
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pass # taking zero to any negative exponent should fail
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else:
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raise ValueError, "pow(%s, %s) did not fail" % (zero, exp)
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print " Testing 3-argument pow() function..."
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il, ih = -20, 20
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jl, jh = -5, 5
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kl, kh = -10, 10
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compare = cmp
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if type == float:
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il = 1
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compare = test_support.fcmp
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elif type == int:
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jl = 0
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elif type == long:
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jl, jh = 0, 15
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for i in range(il, ih+1):
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for j in range(jl, jh+1):
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for k in range(kl, kh+1):
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if k != 0:
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if type == float or j < 0:
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try:
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pow(type(i),j,k)
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except TypeError:
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pass
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else:
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raise ValueError, "expected TypeError from " + \
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"pow%r" % ((type(i), j, k),)
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continue
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if compare(pow(type(i),j,k), pow(type(i),j)% type(k)):
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raise ValueError, "pow(" +str(i)+ "," +str(j)+ \
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"," +str(k)+ ") != pow(" +str(i)+ "," + \
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str(j)+ ") % " +str(k)
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print 'Testing integer mode...'
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powtest(int)
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print 'Testing long integer mode...'
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powtest(long)
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print 'Testing floating point mode...'
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powtest(float)
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# Other tests-- not very systematic
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print 'The number in both columns should match.'
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print `pow(3,3) % 8`, `pow(3,3,8)`
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print `pow(3,3) % -8`, `pow(3,3,-8)`
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print `pow(3,2) % -2`, `pow(3,2,-2)`
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print `pow(-3,3) % 8`, `pow(-3,3,8)`
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print `pow(-3,3) % -8`, `pow(-3,3,-8)`
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print `pow(5,2) % -8`, `pow(5,2,-8)`
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print
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print `pow(3L,3L) % 8`, `pow(3L,3L,8)`
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print `pow(3L,3L) % -8`, `pow(3L,3L,-8)`
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print `pow(3L,2) % -2`, `pow(3L,2,-2)`
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print `pow(-3L,3L) % 8`, `pow(-3L,3L,8)`
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print `pow(-3L,3L) % -8`, `pow(-3L,3L,-8)`
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print `pow(5L,2) % -8`, `pow(5L,2,-8)`
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print
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print
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for i in range(-10, 11):
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for j in range(0, 6):
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for k in range(-7, 11):
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if j >= 0 and k != 0:
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o = pow(i,j) % k
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n = pow(i,j,k)
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if o != n: print 'Integer mismatch:', i,j,k
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if j >= 0 and k != 0:
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o = pow(long(i),j) % k
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n = pow(long(i),j,k)
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if o != n: print 'Integer mismatch:', i,j,k
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