What does s mean in a python format string

Question

What does  s mean in Python  And what does the following bit of code do   For instance       if len sys argv   lt  2       sys exit  Usage   s database-name    sys argv 0     if not os path exists sys argv 1         sys exit  ERROR  Database  s was not found     sys argv 1

User · Answer

Andrew s answer is good   And just to help you out a bit more  here s how you use multiple formatting in one string   Hello  s  my name is  s      john    mike     Hello john  my name is mike     If you are using ints instead of string  use  d instead of  s    My name is  s and i m  d      john   12   My name is john and i m 12

User · Answer

The format method was introduced in Python 2 6   It is more capable and not much more difficult to use    gt  gt  gt   Hello     my name is     format  john    mike    Hello john  my name is mike     gt  gt  gt    1    0   format  world    Hello    Hello  world    gt  gt  gt    greeting       format  world   greeting  Hello    Hello  world    gt  gt  gt    s    name    s1    hello    s2    sibal     gt  gt  gt    s   name  s1    hello

User · Answer

It is a string formatting syntax  which it borrows from C    Please see  PyFormat       Python supports formatting values into   strings  Although this can include   very complicated expressions  the most   basic usage is to insert values into a   string with the  s placeholder    Edit  Here is a really simple example    Python2 name   raw input  who are you     print  hello  s     name     Python3  name   input  who are you     print  hello  s     name      The  s token allows me to insert  and potentially format  a string   Notice that the  s token is replaced by whatever I pass to the string after the   symbol   Notice also that I am using a tuple here as well  when you only have one string using a tuple is optional  to illustrate that multiple strings can be inserted and formatted in one statement

User · Answer

Here is a good example in Python3      gt  gt  gt  a   input  What is your name      What is your name Peter     gt  gt  gt  b   input  Where are you from      Where are you from DE     gt  gt  gt  print  So you are  s of  s     a  b     So you are Peter of DE

User · Answer

s indicates a conversion type of string when using python s string formatting capabilities  More specifically   s converts a specified value to a string using the str   function  Compare this with the  r conversion type that uses the repr   function for value conversion   Take a look at the docs for string formatting

User · Answer

sand  d are Format Specifiers or placeholders for formatting strings decimals floats etc    MOST common used Format specifier    s   string   d   decimals   f   float  Self explanatory code   name    Gandalf  extendedName    the Grey  age   84 IQ   149 9 print  type name     type name    type name    lt class  str  gt  print  type age     type age      type age    lt class  int  gt     print  type IQ     type IQ        type IQ    lt class  float  gt      print   s  s  s age is  d with incredible IQ of  f     name  extendedName  age  IQ    Gandalf the Grey s age is 84 with incredible IQ of 149 900000    Same output can be printed in following ways    print    0   1   s age is  2  with incredible IQ of  3    format name  extendedName  age  IQ              with help of older method print          s age is    with incredible IQ of      format name  extendedName  age  IQ              with help of older method  print  Multiplication of  d and  f is  f    age  IQ  age IQ    Multiplication of 84 and 149 900000 is 12591 600000             storing formattings in string  sub1    python string   sub2    an arg   a    i am a  s    sub1 b    i am a  0   format sub1   c    with   kwarg s       kwarg  sub2  d    with  kwarg    format kwarg sub2   print a        i am a python string   print b       i am a python string   print c        with an arg   print d       with an arg

User · Answer

In answer to your second question   What does this code do      This is fairly standard error-checking code for a Python script that accepts command-line arguments   So the first if statement translates to   if you haven t passed me an argument  I m going to tell you how you should pass me an argument in the future  e g  you ll see this on-screen   Usage  myscript py database-name   The next if statement checks to see if the  database-name  you passed to the script actually exists on the filesystem   If not  you ll get a message like this   ERROR  Database database-name was not found    From the documentation      argv 0  is the script name  it is   operating system dependent whether   this is a full pathname or not   If   the command was executed using the -c   command line option to the   interpreter  argv 0  is set to the   string  -c   If no script name was   passed to the Python interpreter    argv 0  is the empty string

[python] What does %s mean in a python format string?

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