小编Ren*_*ené的帖子

我是python的新手,我写的是:

t = 0.  
while t<4.9:  
    t = t + 0.1  
    if t == 1.:
        ... do something ...

我注意到if语句从未被执行过.所以我修改了代码看起来像这样:

''' Case a'''
t = 0.  
while t<4.9:  
    t = t + 0.1  
print(t)
print(t == 5.)

当我运行这个时,我得到:

>>> ================================ RESTART ================================
>>>  
5.0  
False  

这是一个惊喜,因为我希望比较测试为True.然后,我尝试了以下两种情况:

''' Case b'''
t = 0
while t<5:
    t = t + 1
print(t)
print(t == 5)

''' Case c'''
t = 0.
while t<5:
    t = t + 0.5
print(t)
print(t == 5) …