pi = 3.141592653589793 formatted_string = "Pi is approximately {:.2f} or {:.5f} decimal places.".format(pi, pi) print(formatted_string) # 输出:Pi is approximately 3.14 or 3.14159 decimal places.注意事项 在使用format函数时,有一些技巧和注意事项可以帮助你更有效地使用它。了解不同的...
(1)使用format函数 python value = 0.5 # 50% in decimal form percentage = "{:.2f}%".format(value) # format the value to a string with 2 decimal places and append a "%" sign print(percentage) # output: 50.00% (2)使用f-string python value = 0.5 # 50% in decimal form perc...
num=3.1415926formatted_num="{:.2f}".format(num)print(formatted_num)# 输出:3.14 1. 2. 3. 3. 使用decimal模块进行精确计算 在Python中,有时候使用浮点数进行计算会存在精度损失的问题。为了解决这个问题,可以使用decimal模块进行精确计算。该模块提供了一个Decimal类,用于精确表示小数。 下面是一个示例,我们使...
NumberFormatter+format(float number, str format)+formatAsPercentage(float number, int decimalPlaces)DecimalFormatter+formatToDecimal(float number, int decimalPlaces)PercentageFormatter+formatToPercentage(float number, int decimalPlaces) 在这个类图中,NumberFormatter作为主要的格式化类,它可以调用DecimalFormatter和...
格式化输出单个数字的时候,可以使用内置的 format() 函数,比如: 1 >>> x = 1234.56789 2 3 >>> # Two decimal places of accuracy 4 >>> format(x, '0.2f') #无空格,小数保留2位 5 '1234.57' 6 7 >>> # Right justified in 10 chars, one-digit accuracy 8 >>> format(x, '>10.1f') #...
(serializers.ModelSerializer):"""序列化商品models"""create_time=serializers.DateTimeField(format='%Y-%m-%d %H:%M:%S',required=False)update_time=serializers.DateTimeField(format='%Y-%m-%d %H:%M:%S',required=False)goods_price=serializers.DecimalField(max_digits=10,decimal_places=2,max_value=...
TEXT:可以使用str.format函数来实现类似的功能。例如:# Let's assume we have a dataframe dfdf = pd.DataFrame({ 'A': [1, 2, 3, 4], 'B': [0.1, 0.2, 0.3, 0.4]})# We want to format the values in column B as text with two decimal placesdf['C'] = df['B'].apply...
update_time = serializers.DateTimeField(format='%Y-%m-%d %H:%M:%S', required=False) goods_price = serializers.DecimalField(max_digits=10, decimal_places=2, max_value=10000.00, min_value=0.00)classMeta: model = Goods fields ='__all__'# 返回全部的字段 ...
用string.format:>>> msg = 'hello world'>>> 'msg: {}'.format(msg)'msg: hello world'有了f-string后,可以简化成如下:>>> msg = 'hello world'>>> f'msg: {msg}''msg: hello world’可以看到,用fstring明显就清晰简化了很多,并且也更加具有可读性。fstring的一般用法如下:可以f或者F开头,...
with a colon to separate it from the field name that we saw before. After thecolon, we write “.2f”. This means we’re going to format afloat numberand that there should betwo digits after the decimal dot. So no matter what the price is, our function always prints two decimals. ...