What s the difference between s and d in Python string formatting

Question

I don t understand what  s and  d do and how they work

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The  d and  s string formatting  commands  are used to format strings  The  d is for numbers  and  s is for strings   For an example   print   s     hi     and  print   d    34 6    To pass multiple arguments   print   s  s  s d      hi    there    user   123456   will return hi there user123456

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They are used for formatting strings   s acts a placeholder for a string while  d acts as a placeholder for a number  Their associated values are passed in via a tuple using the   operator    name    marcog  number   42 print   s  d     name  number    will print marcog 42  Note that name is a string   s  and number is an integer   d for decimal    See https   docs python org 3 library stdtypes html printf-style-string-formatting for details   In Python 3 the example would be   print   s  d     name  number

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They are format specifiers  They are used when you want to include the value of your Python expressions into strings  with a specific format enforced   See Dive into Python for a relatively detailed introduction

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s is used as a placeholder for string values you want to inject into a formatted string    d is used as a placeholder for numeric or decimal values   For example  for python 3   print    s is  d years old      Joe   42     Would output  Joe is 42 years old

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In case you would like to avoid  s or  d then    name    marcog  number   42 print   my name is  name  and my age is    number    Output   my name is marcog and my name is 42

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As per latest standards  this is how it should be done   print  My name is   s  and my number is  d   format  Agnel Vishal  100     Do check python3 6 docs and sample program

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d and  s are placeholders  they work as a replaceable variable  For example  if you create 2 variables  variable one    Stackoverflow  variable two   45   you can assign those variables to a sentence in a string using a tuple of the variables   variable 3    I was searching for an answer in  s and found more than  d answers to my question    Note that  s works for String and  d work for numerical or decimal variables   if you print variable 3 it would look like this  print variable 3    variable one  variable two     I was searching for an answer in StackOverflow and found more than 45 answers to my question

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s is used to hold space for string  d is used to hold space for number  name    Moses   age   23 print  My name is  s am CEO at MoTech Computers    name  print  Current am  d years old   age  print  So Am  s and am  d years old    name age     Program output  this video goes deep about that tip https   www youtube com watch v 4zN5YsuiqMA

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speaking of which      python3 6 comes with f-strings which  makes things much easier in formatting   now if your python version is greater than 3 6 you can format your strings with these available methods   name    python   print   i code with  s   name             with help of older method print   i code with  0   format name      with help of format print  f i code with  name                with help of f-strings

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Here is the basic example to demonstrate the Python string formatting and a new way to do it  my word    epic  my number   1  print  The  s number is  d      my word  my number      traditional substitution with   operator    The epic number is 1  print f The  my word  number is  my number        newer format string style    The epic number is 1  Both prints the same

User · Answer

These are placeholders   For example   Hi  s I have  d donuts     Alice   42   This line of code will substitute  s with Alice  str  and  d with 42   Output   Hi Alice I have 42 donuts   This could be achieved with a     most of the time  To gain a deeper understanding to your question  you may want to check       format   as well  Here is one example  Python string formatting    vs   format  also see here a google python tutorial video   40   it has some explanations https   www youtube com watch v tKTZoB2Vjuk

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These are all informative answers  but none are quite getting at the core of what the difference is between  s and  d     s tells the formatter to call the str   function on the argument and since we are coercing to a string by definition   s is essentially just performing str arg      d on the other hand  is calling int   on the argument before calling str    like str int arg    This will cause int coercion as well as str coercion    For example  I can convert a hex value to decimal     gt  gt  gt    d    0x15  21    or truncate a float    gt  gt  gt    d    34 5  34    But the operation will raise an exception if the argument isn t a number     gt  gt  gt    d     thirteen  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  TypeError   d format  a number is required  not str   So if the intent is just to call str arg   then  s is sufficient  but if you need extra formatting  like formatting float decimal places  or other coercion  then the other format symbols are needed    With the f-string notation  when you leave the formatter out  the default is str    gt  gt  gt  a   1  gt  gt  gt  f  a    1   gt  gt  gt  f  a d    1   gt  gt  gt  a    1   gt  gt  gt  f  a d   Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  ValueError  Unknown format code  d  for object of type  str    The same is true with string format  the default is str    gt  gt  gt  a   1  gt  gt  gt       format a   1   gt  gt  gt     s   format a   1   gt  gt  gt     d   format a   1

User · Answer

from python 3 doc   d is for decimal integer   s is for generic string or object and in case of object  it will be converted to string  Consider the following code  name   giacomo  number   4 3 print   s  s  d  f  g     name  number  number  number  number     the out put will be     giacomo 4 3 4 4 300000 4 3   as you can see  d will truncate to integer   s will maintain formatting   f will print as float and  g is used for generic number  obviously  print   d     name     will generate an exception  you cannot convert string to number

[python] What's the difference between %s and %d in Python string formatting?

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