The%s%d%f of Python

%s string

2. string="Hello"
6. #%s The result is hello when printing
8. print "string=%s"% string # Output:string=hello
12. #%2s means that the string length is 2, and when the original string is longer than 2 o'clock, it is printed at the original length, so the%2s print result is still Hello
14. print "string=%2s"% string # Output:string=hello
18. #%7s means the string length is 7, when the length of the original string is less than 7 o'clock, the left side of the original string is blank,
20. #所以%7s Print result is Hello
22. print "string=%7s"% string # output:string= Hello
26. #%-7s means string length is 7, when the length of the original string is less than 7 o'clock, the right side of the original string to fill the space,
28. #所以%-7s Print result is Hello
30. print "string=%-7s!"% string # Output:string=hello!
34. #%.2s means to intercept the first 2 characters of a string, so%.2s prints the result of the He
36. print "string=%.2s"% string # output:string=he
40. #%.7s means to intercept the first 7 characters of a string, which is the string itself when the original string is less than 7 o'clock long .
42. #所以%.7s Print result is Hello
44. print "string=%.7s"% string # Output:string=hello
48. #%a.bs This format is a synthesis of the above two formats, starting with the number B after the decimal point to intercept the string,
50. #当截取的字符串长度小于a时, you also need to fill the left side of the space
52. print "string=%7.2s"% string # output:string= He
54. print "string=%2.7s"% string # Output:string=hello
56. print "string=%10.7s"% string # output:string= Hello
60. #还可以用%*.*s to represent precision, the values of two * are specified in the first two digits of the following parentheses, respectively
62. print "string=%*.*s"% (7,2,string) # output:string= He

%d integral type

2. num=
6. #%d The result when printing
8. print "num=%d"% num # output:num=14
12. #%1d means that the printed result is a 1-bit integer, and when the number of digits in the integer exceeds 1 bits, the original value is printed, so the%1d is printed as
14. print "num=%1d"% num # output:num=14
18. #%3d means that the printed result is a 3-bit integer, and when the number of digits in the integer is not 3 bits, the left side of the integer is blank, so the print result of the%3d is
20. print "num=%3d"% num # output:num=
24. #%-3d means that the printed result is a 3-bit integer, and when the number of digits in the integer is not 3 bits, the right side of the integer is blank, so the%3d print is 14_
26. print "num=%-3d"% num # output:num=14_
30. #%05d means that the printed result is a 5-bit integer, and when the number of digits in the integer is not 5 bits, the left side of the integer is 0, so the%05d print is 00014
32. print "num=%05d"% num # output:num=00014
36. #%.3d 3 After the decimal point means that the printed result is a 3-bit integer,
38. #当整数的位数不够3位时, the left side of the integer is 0, so the%.3d print result is 014
40. print "num=%.3d"% num # output:num=014
44. #%.0003d 0003 and 3 after the decimal point represent 3, which means that the printed result is a 3-bit integer,
46. #当整数的位数不够3位时, 0 is added to the left of the integer, so the%.3d print result is 014
48. print "num=%.0003d"% num # output:num=014
52. #%5.3d is a combination of two methods of completion, when the number of digits is not enough 3 o'clock, first on the left 0, or not enough 5 bits, and then on the left to fill the space,
54. #规则就是补0优先, the final length of the selection of the larger one, so%5.3d printing results or 014
56. print "num=%5.3d"% num # output:num= 014
60. #%05.3d is a combination of two methods of completion, when the number of digits is not enough 3 o'clock, first on the left 0, or not enough 5 bits,
62. #由于是05, and then on the left side of 0, the final length of the selection of the larger one, so%05.3d printing results or 00014
64. print "num=%05.3d"% num # output:num=00014
68. #还可以用%*.*d to represent precision, the values of two * are specified in the first two digits of the following parentheses, respectively
70. #如下, but this way 04 lost the function of 0, can only fill the space, only 3 after the decimal point to fill 0
72. print "num=%*.*d"% (3,num) # output:num= 014

%f floating Point type

2. Import Math
6. #%a.bf,a indicates the print length of the floating-point number, and B indicates the precision after the decimal point of the floating point
10. #只是%f is the original value, the default is 5 digits after the decimal point
12. print "pi=%f"% Math.PI # output:pi=3.141593
16. #只是%9f, the print length of 9 digits, the decimal point also accounted for one bit, not enough left to fill the space
18. print "pi=%9f"% Math.PI # output:pi=_3.141593
22. #只有. When there is no subsequent number, the decimal output integer is removed, and 03 indicates insufficient 3 digits to the left of 0
24. print "pi=%03.f"% Math.PI # output:pi=003
28. #%6.3f indicates that the decimal point is accurate to 3 digits, with a total length of 6 digits, including a decimal point, not enough left fill space
30. print "pi=%6.3f"% Math.PI # output:pi=_3.142
34. #%-6.3f indicates that the decimal point is accurate to 3 digits, with a total length of 6 digits, including a decimal point, not enough right fill space
36. print "pi=%-6.3f"% Math.PI # output:pi=3.142_
40. #还可以用%*.*f to represent precision, the values of two * are specified in the first two digits of the following parentheses, respectively
42. #如下, but this way 06 loses the function of 0, can only fill the space
44. print "pi=%*.*f"% (3,math.pi) # output:pi=_3.142
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The%s%d%f of Python