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Possible Duplicate:
python - decimal place issues with floats
Python float equality weirdness
在下面的代码中，我有变量 percentage，它是一个 float 。我已将其设置为如果 number 达到 10,000，percentage 应该增加 .01 .
# Tries to find a number that when squared and 5%'ed is still a square.
import math
print("Script has started:\n")
percentage = .1
number = 1
while number != -1:
number = number + 1
num_powered = number ** 2
num_5per = num_powered * percentage
num_5per_sqrt = math.sqrt(num_5per)
num_list = list(str(num_5per_sqrt))
dot_location = num_list.index(".")
not_zero = 0
for x in num_list[dot_location + 1:]:
if x != "0":
not_zero = 1
break
if not_zero == 0:
print("*********************************")
print("Map :",number)
print("Safe-Area :",num_5per_sqrt)
print("Percentage :",percentage)
print("*********************************")
input()
if number > 10000:
number = 0
percentage = percentage + .01
print(percentage)
输出:
0.11
0.12
0.13
0.14
0.15000000000000002 # Here is where it goes crazy
0.16000000000000003