firstName ='Bob'lastName='Dylan'print('你的名字是%s, 你的姓是%s'% (firstName, lastName)) 对于string, list等类型的变量,一律可用%s代替。 对于int类型,用%d 对于float类型,用%f 如果需要对float类型的变量进行小数点后位数的控制,则使用%.<number of digits>f。如 pai
print("This number in scientific notation: %e" % 1234567) print("My chances are %%%d" % 100) # 'My chances are %100' 1. 2. 3. 4. 5. 6. 注意:%的方式虽然可以实现字符串格式化,但在 Python 3.6 以后,官方更推荐使用 f-string(格式化字符串)的方式,例如: name = "Alice" age = 25 pri...
round(number[, ndigits]) 参数: number - 这是一个数字表达式。 ndigits - 表示从小数点到最后四舍五入的位数。默认值为0。返回值该方法返回x的小数点舍入为n位数后的值。 round()函数只有一个参数,不指定位数的时候,返回一个整数,而且是最靠近的整数,类似于四舍五入 当指定取舍的小数点位数的时候,一般...
f-string,亦称为格式化字符串常量(formatted string literals),是Python3.6新引入的一种字符串格式化方法,该方法源于PEP 498 – Literal String Interpolation,主要目的是使格式化字符串的操作更加简便。f-string在形式上是以 f 或 F 修饰符引领的字符串(f'xxx' 或 F'xxx'),以大括号 {} 标明被替换的字段;f-s...
String objects have a built-in functionality to make format changes, which also include an additional way of concatenating strings. Let’s take a look at it: In the example above, I generated a new string based on the input values of two already-created variables by using thecurly brackets...
负号指时数字应该是左对齐的,“0”告诉python用前导0填充数字,正号指时数字总是显示它的正负(+,-)符号,即使数字是正数也不例外。 可指定最小的字段宽度,如:"%5d" % 2。也可用句点符指定附加的精度,如:"%.3d" % 3。 e.g. 例:数字格式化
Format String Syntax Replacement Fields Syntax 替代字段特点 standard format specifier 对齐(align) 符号(sign) \#号选项 千位分隔符(thousand separator) 最小域宽(field width) 精度(precision) 类型(type) 什么是str.format呢? str.format()就是字符串类型的一个函数,它用来执行字符串格式化操作。
How String format() works? Theformat()reads the type of arguments passed to it and formats it according to the format codes defined in the string. For positional arguments Positional arguments Here, Argument 0 is a string "Adam" and Argument 1 is a floating number 230.2346. ...
You can gain additional control over the resulting format by using conversion flags, which you’ll learn more about in an upcoming section.Remove ads Floating-Point Conversion TypesConversion types f and F convert to a string representation of a floating-point number, while e and E produce a ...
#!/usr/bin/pythonimport re phone = "2004-959-559 # This is Phone Number"# Delete Python-style commentsnum = re.sub(r'#.*$', "", phone)print "Phone Num : ", num# Remove anything other than digitsnum = re.sub(r'\D', "", phone) print "Phone Num : ", num 以上实例执行结果...