如何在 Python 中将 True 切换为 False
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How to switch True to False in Python
提问by NDKC
What operation do I need to do to always get a False value to become True or to get a True value to become False? In other words, what do I do to switch the Boolean value of a given variable?
我需要做什么操作才能总是让 False 值变成 True 或让 True 值变成 False？换句话说，如何切换给定变量的布尔值？
new_dict = {}
for i in range(1, 101):
new_dict[i] = False
i = 2
while i < 101:
for x in range(1, 101):
if new_dict[x] % i == 0:
a = new_dict[x]
new_dict[x] = not a
i += 1
for a in new_dict:
print 'Light #%d --> %r' % (a, new_dict[a])
The output below is only True. From this, I understand that what I did for some reason is not changing every other value to False. Why is this happening?
下面的输出仅为 True。由此，我明白我出于某种原因所做的并不是将所有其他值都更改为 False。为什么会这样？
Does anyone have any idea why?
有谁知道为什么？
Light #1 --> True
Light #2 --> True
Light #3 --> True
Light #4 --> True
Light #5 --> True
Light #6 --> True
Light #7 --> True
Light #8 --> True
Light #9 --> True
Light #10 --> True
Light #11 --> True
Light #12 --> True
Light #13 --> True
Light #14 --> True
Light #15 --> True
Light #16 --> True
Light #17 --> True
Light #18 --> True
Light #19 --> True
Light #20 --> True
Light #21 --> True
Light #22 --> True
Light #23 --> True
Light #24 --> True
Light #25 --> True
Light #26 --> True
Light #27 --> True
Light #28 --> True
Light #29 --> True
Light #30 --> True
Light #31 --> True
Light #32 --> True
Light #33 --> True
Light #34 --> True
Light #35 --> True
Light #36 --> True
Light #37 --> True
Light #38 --> True
Light #39 --> True
Light #40 --> True
Light #41 --> True
Light #42 --> True
Light #43 --> True
Light #44 --> True
Light #45 --> True
Light #46 --> True
Light #47 --> True
Light #48 --> True
Light #49 --> True
Light #50 --> True
Light #51 --> True
Light #52 --> True
Light #53 --> True
Light #54 --> True
Light #55 --> True
Light #56 --> True
Light #57 --> True
Light #58 --> True
Light #59 --> True
Light #60 --> True
Light #61 --> True
Light #62 --> True
Light #63 --> True
Light #64 --> True
Light #65 --> True
Light #66 --> True
Light #67 --> True
Light #68 --> True
Light #69 --> True
Light #70 --> True
Light #71 --> True
Light #72 --> True
Light #73 --> True
Light #74 --> True
Light #75 --> True
Light #76 --> True
Light #77 --> True
Light #78 --> True
Light #79 --> True
Light #80 --> True
Light #81 --> True
Light #82 --> True
Light #83 --> True
Light #84 --> True
Light #85 --> True
Light #86 --> True
Light #87 --> True
Light #88 --> True
Light #89 --> True
Light #90 --> True
Light #91 --> True
Light #92 --> True
Light #93 --> True
Light #94 --> True
Light #95 --> True
Light #96 --> True
Light #97 --> True
Light #98 --> True
Light #99 --> True
Light #100 --> True
The question here How do I get the opposite (negation) of a Boolean in Python?and here python how to "negate" value : if true return false, if false return trueseem to be the same but in my case, that simple concept is simply not working...
这里的问题如何在 Python 中获得布尔值的相反（否定）？在这里python如何“否定”值：如果真返回假，如果假返回真似乎是一样的，但在我的情况下，这个简单的概念根本不起作用......
Thanks, I really appreciate all the help guys!!!
谢谢，我真的很感谢所有的帮助人！！！
回答by kchason
Assuming a variable myBool, you can set it with the notkeyword.
假设一个变量myBool，你可以用not关键字设置它。
myBool = True
print(myBool)
myBool = not myBool
print(myBool)
Results in:
结果是：
True
False
回答by Totem
If you are, for instance, being returned a boolean value from a function, you could do:
例如，如果您从函数返回一个布尔值，您可以这样做：
bool_value = not my_function()
NOTing the boolean value will invert it to the opposite value. It works because in Python:
注意布尔值会将其反转为相反的值。它之所以有效，是因为在 Python 中：
>>> not True
False
>>> not False
True
So:
所以：
>>> value = True
>>> print(value)
True
>>> print(not value)
False
回答by bjohnson
Use the notoperator:
使用not运算符：
In [1]: b = True
In [2]: not b
Out[2]: False
In [3]: b = not b
In [4]: b
Out[4]: False
In [5]: not b
Out[5]: True
