# 设置颜色(AI推荐)self.bg_color ="#f0f0f0"self.button_color ="#e0e0e0"self.special_button_color ="#d0d0ff"self.side_panel_color ="#e8e8e8"self.root.configure(bg=self.bg_color)# 初始化变量self.num1 =Noneself.operator =None
11.8. Decimal Floating Point ArithmeticThe decimal module offers a Decimal datatype for decimal floating point arithmetic. Compared to the built-in float implementation of binary floating point, the class is especially helpful forfinancial applications and other uses which require exact decimal ...
Formatting with two decimal places value=123.45678formatted_value="{:.2f}".format(value)print(formatted_value)# Output: 123.46print(type(formatted_value))# Output: <class 'str'> The output returns a string. To convert the output to afloat, use thefloat()function. ...
function_name(arg1, arg2, ..., argN) You’ll need to pass arguments to a function call only if the function requires them. The parentheses, on the other hand, are always required in a function call. If you forget them, then you won’t be calling the function but referencing it as...
<< Bitwise left shift a << n Each bit is shifted left n places. As you can see in this table, most bitwise operators are binary, which means that they expect two operands. The bitwise NOT operator (~) is the only unary operator because it expects a single operand, which should always...
数字类型: int整型、long长整型 (python 2)、float浮点、complex复数、以及bool布尔值(0和1) bool类型: True和False,其分别对应二进制中的0和1; Flase的值有:None、空(即 ""、[]、{}、())、0 str类型: 可以使用单引号 " 或者双引号 “” 来创建字符串 list列表, dict字典, set集合, tuple元组 ...
You can override the default alignment with numalign andstralign named arguments. Possible column alignments are:right,center,left, decimal (only for numbers). Aligning by a decimal point works best when you need to comparenumbers at a glance: ...
(e.g.__init__or__lt__). They're also not as well documented as they need to be. All of the magic methods for Python appear in the same section in the Python docs, but they're scattered about and only loosely organized. There's hardly an example to be found in that section (...
例如:float_1 = 10.5是属于Float字面量。 字符串字面量是由引号括起来的一系列字符。我们可以对字符串使用单引号,双引号 或 三引号。并且,字符字面量是用单引号或双引号引起来的单个字符。例如:strings = "This is Python"。 布尔字面量。布尔字面量可以具有两个值中的任何一个:True 或False。例如:a = ...
float_format : one-parameter function, optional, default None Formatter function to apply to columns' elements if they are floats. This function must return a unicode string and will be applied only to the non-``NaN`` elements, with ``NaN`` being handled by ``na_rep``. .. versioncha...