Python Data format:%s string,%d integer,%f floating-point

Tag: Address parameter floating point interception is 2.7 pytho port rule

Format character%
Percent percentile sign #就是输出一个%
%c character and its ASCII code
%s string
%d signed integer (decimal)
%u unsigned integer (decimal)
%o unsigned integer (octal)
%x unsigned integer (hexadecimal)
%x unsigned integer (16 uppercase characters)
%e floating-point numbers (scientific notation)
%E floating point number (scientific notation, E instead of e)
%f floating point number (with decimal point symbol)
%g floating-point numbers (%e or%f depending on the size of the value)
%G floating-point number (similar to%G)
%p pointer (memory address with hexadecimal print value)
%n the number of stored output characters into the next variable in the parameter list

%s string

string="Hello"        #%s The result is hello when printingPrint "string=%s"% string#Output:string=hello    #%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 HelloPrint "string=%2s"% string#Output:string=hello    #%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,#so the print result of%7s is HelloPrint "string=%7s"% string#output:string= Hello    #%-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,#so the print result of%-7s is HelloPrint "string=%-7s!"% string#Output:string=hello!     #%.2s means to intercept the first 2 characters of a string, so%.2s prints the result of the HePrint "string=%.2s"% string#Output:string=he    #%.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 .#so the print result of%.7s is HelloPrint "string=%.7s"% string#Output:string=hello    #%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,#when the length of the truncated string is less than a, you also need to fill the left side of the spacePrint "string=%7.2s"% string#output:string= HePrint "string=%2.7s"% string#Output:string=helloPrint "string=%10.7s"% string#output:string= Hello    #You can also use%*.*s to represent precision, and the values of two * are specified in the first two digits of the following parentheses, respectivelyPrint "string=%*.*s"% (7,2,string)#output:string= He

%d integral type

Num=14#%d results when printingPrint "num=%d"% num#output:num=14    #%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 asPrint "num=%1d"% num#output:num=14    #%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 isPrint "num=%3d"% num#output:num=    #%-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_Print "num=%-3d"% num#output:num=14_    #%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 00014Print "num=%05d"% num#output:num=00014    #%.3d 3 After the decimal point means that the printed result is a 3-bit integer,#when the number of digits in an integer is not 3 bits, the left side of the integer is 0, so the%.3d print result is 014Print "Num=%.3d"% num#output:num=014    #%.0003d 0003 and 3 after the decimal point represent 3, which means that the printed result is a 3-bit integer,#when the number of digits in an integer is not 3 bits, 0 is added to the left of the integer, so the%.3d print is 014Print "num=%.0003d"% num#output:num=014    #%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,#The rule is to fill 0 priority, the final length selection of the larger one, so%5.3d printing results or 014Print "Num=%5.3d"% num#output:num= 014    #%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,#because it is 05, and then 0 on the left, the final length of the selected value of the larger one, so%05.3d printing results or 00014Print "Num=%05.3d"% num#output:num=00014    #You can also use%*.*d to represent precision, and the values of two * are specified in the first two digits of the following parentheses, respectively#as follows, but this way 04 loses the function of 0, can only fill the space, only after the decimal point 3 to fill 0Print "num=%*.*d"% (04,3,num)#output:num= 014

%f floating Point type

ImportMath#%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    #only%f when the original value, the default is the number of 5 digits after the decimal pointPrint "pi=%f"% Math.PI#output:pi=3.141593    #just%9f, the print length of 9 digits, the decimal point also accounted for one bit, not enough left to fill the spacePrint "pi=%9f"% Math.PI#output:pi=_3.141593    #only. When there are no subsequent digits, the decimal output integer is removed, and 03 is not enough 3 digits to the left of 0Print "PI=%03.F"% Math.PI#output:pi=003    #%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 spacePrint "pi=%6.3f"% Math.PI#output:pi=_3.142    #%-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 spacePrint "pi=%-6.3f"% Math.PI#output:pi=3.142_    #You can also use%*.*f to represent precision, and the values of two * are specified in the first two digits of the following parentheses, respectively#as follows, but this way 06 loses the function of 0, can only fill the spacePrint "pi=%*.*f"% (06,3,MATH.PI)#output:pi=_3.142

Practical

# generate a 9*9 multiplication table Print ('\ n''"%d*%d=%2s" for inch  for  in range (1,10)]))

Python Data format:%s string,%d integer,%f floating-point