How to convert false to 0 and true to 1 in Python

Question

Is there a way to convert true of type unicode to 1 and false of type unicode to 0  in Python    For example  x     true  and type x     unicode  I want x   1  PS  I don   t want to use if-else

User · Answer

You can use x astype  uint8   where x is your Boolean array

User · Answer

Any of the following will work  s    quot true quot    s     true   real 1   s     false   real 0   s     true   conjugate       1   s        conjugate   0   s     true     int     1   s     opal     int         0   def as int s       return  s     true     int       gt  gt  gt  gt  as int  false   0  gt  gt  gt  gt  as int  true   1

User · Answer

only with this   const a   true  const b   false   console log  a    1 console log  b    0

User · Answer

Here s a yet another solution to your problem   def to bool s       return 1 - sum map ord  s     2       return 1 - sum s encode  ascii      2    Alternative for Python 3   It works because the sum of the ASCII codes of  true  is 448  which is even  while the sum of the ASCII codes of  false  is 523 which is odd     The funny thing about this solution is that its result is pretty random if the input is not one of  true  or  false   Half of the time it will return 0  and the other half 1  The variant using encode will raise an encoding error if the input is not ASCII  thus increasing the undefined-ness of the behaviour      Seriously  I believe the most readable  and faster  solution is to use an if   def to bool s       return 1 if s     true  else 0   See some microbenchmarks   In  14   def most readable s                return 1 if s     true  else 0  In  15   def int cast s                return int s     true    In  16   def str2bool s                try                   return   false    true   index s               except  ValueError  AttributeError                    raise ValueError    In  17   def str2bool2 s                try                   return   false    true   index s               except  ValueError  AttributeError                    raise ValueError    In  18   def to bool s                return 1 - sum s encode  ascii      2  In  19    timeit most readable  true   10000000 loops  best of 3  112 ns per loop  In  20    timeit most readable  false   10000000 loops  best of 3  109 ns per loop  In  21    timeit int cast  true   1000000 loops  best of 3  259 ns per loop  In  22    timeit int cast  false   1000000 loops  best of 3  262 ns per loop  In  23    timeit str2bool  true   1000000 loops  best of 3  343 ns per loop  In  24    timeit str2bool  false   1000000 loops  best of 3  325 ns per loop  In  25    timeit str2bool2  true   1000000 loops  best of 3  295 ns per loop  In  26    timeit str2bool2  false   1000000 loops  best of 3  277 ns per loop  In  27    timeit to bool  true   1000000 loops  best of 3  607 ns per loop  In  28    timeit to bool  false   1000000 loops  best of 3  612 ns per loop   Notice how the if solution is at least 2 5x times faster than all the other solutions  It does not make sense to put as a requirement to avoid using ifs except if this is some kind of homework  in which case you shouldn t have asked this in the first place

User · Answer

If B is a Boolean array  write  B   B 1    A bit code golfy

User · Answer

False  converts to 0 and   True  converts to 1

User · Answer

bool to int  x    x     true     0  Now the x contains 1 if x     true  else 0   Note  x     true  will return bool which then will be typecasted to int having value  1 if bool value is True else 0  when added with 0

User · Answer

If you need a general purpose conversion from a string which per se is not a bool  you should better write a routine similar to the one depicted below  In keeping with the spirit of duck typing  I have not silently passed the error but converted it as appropriate for the current scenario     gt  gt  gt  def str2bool st   try      return   false    true   index st lower    except  ValueError  AttributeError       raise ValueError  no Valid Conversion Possible      gt  gt  gt  str2bool  garbaze    Traceback  most recent call last     File   lt pyshell 106 gt    line 1  in  lt module gt      str2bool  garbaze     File   lt pyshell 105 gt    line 5  in str2bool     raise TypeError  no Valid COnversion Possible   TypeError  no Valid Conversion Possible  gt  gt  gt  str2bool  false   0  gt  gt  gt  str2bool  True   1

User · Answer

Use int   on a boolean test   x   int x     true     int   turns the boolean into 1 or 0  Note that any value not equal to  true  will result in 0 being returned

[python] How to convert ‘false’ to 0 and ‘true’ to 1 in Python

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