You’re setting alist only once. The first call to “tryway” clears it, then every successive call does nothing.
def tryway():
alist = range(1000)
try:
while True:
alist.pop()
except IndexError:
pass
def ifway():
alist = range(1000)
while True:
if alist == []:
break
else:
alist.pop()
if __name__=='__main__':
from timeit import Timer
print "Testing Try"
tr = Timer("tryway()","from __main__ import tryway")
print tr.timeit(10000)
print "Testing If"
ir = Timer("ifway()","from __main__ import ifway")
print ir.timeit(10000)
>>> Testing Try
>>> 2.09539294243
>>> Testing If
>>> 2.84440898895