How to apply float precision (type specifier) in a conditional f-string?












9















I have the following f-string I want to print out on the condition the variable is available:



f"Percent growth: {self.percent_growth if True else 'No data yet'}"


Which results in:



Percent growth : 0.19824077757643577


So normally I'd use a type specifier for float precision like this:



f'{self.percent_growth:.2f}'


Which would result in:



0.198


But that messes with the if-statement in this case. Either it fails because:



f"Percent profit : {self.percent_profit:.2f if True else 'None yet'}"


The if statement becomes unreachable.
Or in the second way: 



f"Percent profit : {self.percent_profit if True else 'None yet':.2f}"


The f-string fails whenever the condition leads to the else clause.



So my question is, how can I apply the float precision within the f-string when the f-string can result in two types?






python python-3.x f-string







share|improve this question


















  • 1





    I formulated the question this way so it was clear no matter what condition it fails to even execute.

    – NoSplitSherlock
    Mar 1 at 19:32
















9















I have the following f-string I want to print out on the condition the variable is available:



f"Percent growth: {self.percent_growth if True else 'No data yet'}"


Which results in:



Percent growth : 0.19824077757643577


So normally I'd use a type specifier for float precision like this:



f'{self.percent_growth:.2f}'


Which would result in:



0.198


But that messes with the if-statement in this case. Either it fails because:



f"Percent profit : {self.percent_profit:.2f if True else 'None yet'}"


The if statement becomes unreachable.
Or in the second way: 



f"Percent profit : {self.percent_profit if True else 'None yet':.2f}"


The f-string fails whenever the condition leads to the else clause.



So my question is, how can I apply the float precision within the f-string when the f-string can result in two types?






python python-3.x f-string







share|improve this question


















  • 1





    I formulated the question this way so it was clear no matter what condition it fails to even execute.

    – NoSplitSherlock
    Mar 1 at 19:32














9












9








9








I have the following f-string I want to print out on the condition the variable is available:



f"Percent growth: {self.percent_growth if True else 'No data yet'}"


Which results in:



Percent growth : 0.19824077757643577


So normally I'd use a type specifier for float precision like this:



f'{self.percent_growth:.2f}'


Which would result in:



0.198


But that messes with the if-statement in this case. Either it fails because:



f"Percent profit : {self.percent_profit:.2f if True else 'None yet'}"


The if statement becomes unreachable.
Or in the second way: 



f"Percent profit : {self.percent_profit if True else 'None yet':.2f}"


The f-string fails whenever the condition leads to the else clause.



So my question is, how can I apply the float precision within the f-string when the f-string can result in two types?






python python-3.x f-string







share|improve this question














I have the following f-string I want to print out on the condition the variable is available:



f"Percent growth: {self.percent_growth if True else 'No data yet'}"


Which results in:



Percent growth : 0.19824077757643577


So normally I'd use a type specifier for float precision like this:



f'{self.percent_growth:.2f}'


Which would result in:



0.198


But that messes with the if-statement in this case. Either it fails because:



f"Percent profit : {self.percent_profit:.2f if True else 'None yet'}"


The if statement becomes unreachable.
Or in the second way: 



f"Percent profit : {self.percent_profit if True else 'None yet':.2f}"


The f-string fails whenever the condition leads to the else clause.



So my question is, how can I apply the float precision within the f-string when the f-string can result in two types?






python python-3.x f-string




python python-3.x f-string






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 1 at 17:53









NoSplitSherlockNoSplitSherlock

343110




343110








  • 1





    I formulated the question this way so it was clear no matter what condition it fails to even execute.

    – NoSplitSherlock
    Mar 1 at 19:32














  • 1





    I formulated the question this way so it was clear no matter what condition it fails to even execute.

    – NoSplitSherlock
    Mar 1 at 19:32








1




1





I formulated the question this way so it was clear no matter what condition it fails to even execute.

– NoSplitSherlock
Mar 1 at 19:32





I formulated the question this way so it was clear no matter what condition it fails to even execute.

– NoSplitSherlock
Mar 1 at 19:32












3 Answers
3






active

oldest

votes


















10














You could use another f-string for your first condition:



f"Percent profit : {f'{self.percent_profit:.2f}' if True else 'None yet'}"


Admittedly not ideal, but it does the job.






share|improve this answer



















  • 1





    Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

    – Idlehands
    Mar 1 at 18:09













  • @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

    – NoSplitSherlock
    Mar 1 at 18:24






  • 1





    @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:26






  • 1





    @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:43











  • @PatrickArtner Absolutely, that works too.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:54



















2














I think the f string within f string answer is as simple as it gets, but if you want a little bit more readability, consider moving the condition outside the f string:



value = f'{self.percent_profit:.2f}' if True else 'No data yet'

print(f"Percent profit : {value}")





share|improve this answer































    2














    You can use a ternary for the formatter as well - no need to stack 2 f-strings like Nikolas answer does:



    for pg in (2.562345678, 0.9, None):   # 0.0 is also Falsy - careful ;o)
    
    print(f"Percent Growth: {pg if pg else 'No data yet':{'.05f' if pg else ''}}")
    
    # you need to put '.05f' into a string for this to work and not complain


    Output:



    Percent growth: 2.56235
    
Percent growth: 0.90000
    
Percent growth: No data yet





    share|improve this answer





















    • 1





      I love how hacky this is.

      – NoSplitSherlock
      Mar 1 at 19:02











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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    10














    You could use another f-string for your first condition:



    f"Percent profit : {f'{self.percent_profit:.2f}' if True else 'None yet'}"


    Admittedly not ideal, but it does the job.






    share|improve this answer



















    • 1





      Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

      – Idlehands
      Mar 1 at 18:09













    • @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

      – NoSplitSherlock
      Mar 1 at 18:24






    • 1





      @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:26






    • 1





      @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:43











    • @PatrickArtner Absolutely, that works too.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:54
















    10














    You could use another f-string for your first condition:



    f"Percent profit : {f'{self.percent_profit:.2f}' if True else 'None yet'}"


    Admittedly not ideal, but it does the job.






    share|improve this answer



















    • 1





      Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

      – Idlehands
      Mar 1 at 18:09













    • @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

      – NoSplitSherlock
      Mar 1 at 18:24






    • 1





      @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:26






    • 1





      @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:43











    • @PatrickArtner Absolutely, that works too.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:54














    10












    10








    10







    You could use another f-string for your first condition:



    f"Percent profit : {f'{self.percent_profit:.2f}' if True else 'None yet'}"


    Admittedly not ideal, but it does the job.






    share|improve this answer













    You could use another f-string for your first condition:



    f"Percent profit : {f'{self.percent_profit:.2f}' if True else 'None yet'}"


    Admittedly not ideal, but it does the job.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Mar 1 at 17:59









    Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

    1,5331015




    1,5331015








    • 1





      Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

      – Idlehands
      Mar 1 at 18:09













    • @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

      – NoSplitSherlock
      Mar 1 at 18:24






    • 1





      @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:26






    • 1





      @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:43











    • @PatrickArtner Absolutely, that works too.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:54














    • 1





      Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

      – Idlehands
      Mar 1 at 18:09













    • @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

      – NoSplitSherlock
      Mar 1 at 18:24






    • 1





      @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:26






    • 1





      @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:43











    • @PatrickArtner Absolutely, that works too.

      – Nikolas Stevenson-Molnar
      Mar 1 at 18:54








    1




    1





    Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

    – Idlehands
    Mar 1 at 18:09







    Another way is using str.format but I don't think it's any different. f"Percent profit : {'{:.2f}'.format(self.percent_format) if True else 'None yet'}" This is as simple as it gets if OP insists putting the condition within the f string itself.

    – Idlehands
    Mar 1 at 18:09















    @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

    – NoSplitSherlock
    Mar 1 at 18:24





    @Idlehands Isn't it strange though that I can format strings and use conditionals, but not both at the same time?

    – NoSplitSherlock
    Mar 1 at 18:24




    1




    1





    @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:26





    @NoSplitSherlock If both outcomes of the the conditional were the same, you could. I think the tricky part of your example is that your conditional will yield either a float or a string.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:26




    1




    1





    @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:43





    @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:43













    @PatrickArtner Absolutely, that works too.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:54





    @PatrickArtner Absolutely, that works too.

    – Nikolas Stevenson-Molnar
    Mar 1 at 18:54













    2














    I think the f string within f string answer is as simple as it gets, but if you want a little bit more readability, consider moving the condition outside the f string:



    value = f'{self.percent_profit:.2f}' if True else 'No data yet'
    
print(f"Percent profit : {value}")





    share|improve this answer




























      2














      I think the f string within f string answer is as simple as it gets, but if you want a little bit more readability, consider moving the condition outside the f string:



      value = f'{self.percent_profit:.2f}' if True else 'No data yet'
      
print(f"Percent profit : {value}")





      share|improve this answer


























        2












        2








        2







        I think the f string within f string answer is as simple as it gets, but if you want a little bit more readability, consider moving the condition outside the f string:



        value = f'{self.percent_profit:.2f}' if True else 'No data yet'
        
print(f"Percent profit : {value}")





        share|improve this answer













        I think the f string within f string answer is as simple as it gets, but if you want a little bit more readability, consider moving the condition outside the f string:



        value = f'{self.percent_profit:.2f}' if True else 'No data yet'
        
print(f"Percent profit : {value}")






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Mar 1 at 18:12









        IdlehandsIdlehands

        6,0001823




        6,0001823























            2














            You can use a ternary for the formatter as well - no need to stack 2 f-strings like Nikolas answer does:



            for pg in (2.562345678, 0.9, None):   # 0.0 is also Falsy - careful ;o)
            
    print(f"Percent Growth: {pg if pg else 'No data yet':{'.05f' if pg else ''}}")
            
    # you need to put '.05f' into a string for this to work and not complain


            Output:



            Percent growth: 2.56235
            
Percent growth: 0.90000
            
Percent growth: No data yet





            share|improve this answer





















            • 1





              I love how hacky this is.

              – NoSplitSherlock
              Mar 1 at 19:02
















            2














            You can use a ternary for the formatter as well - no need to stack 2 f-strings like Nikolas answer does:



            for pg in (2.562345678, 0.9, None):   # 0.0 is also Falsy - careful ;o)
            
    print(f"Percent Growth: {pg if pg else 'No data yet':{'.05f' if pg else ''}}")
            
    # you need to put '.05f' into a string for this to work and not complain


            Output:



            Percent growth: 2.56235
            
Percent growth: 0.90000
            
Percent growth: No data yet





            share|improve this answer





















            • 1





              I love how hacky this is.

              – NoSplitSherlock
              Mar 1 at 19:02














            2












            2








            2







            You can use a ternary for the formatter as well - no need to stack 2 f-strings like Nikolas answer does:



            for pg in (2.562345678, 0.9, None):   # 0.0 is also Falsy - careful ;o)
            
    print(f"Percent Growth: {pg if pg else 'No data yet':{'.05f' if pg else ''}}")
            
    # you need to put '.05f' into a string for this to work and not complain


            Output:



            Percent growth: 2.56235
            
Percent growth: 0.90000
            
Percent growth: No data yet





            share|improve this answer















            You can use a ternary for the formatter as well - no need to stack 2 f-strings like Nikolas answer does:



            for pg in (2.562345678, 0.9, None):   # 0.0 is also Falsy - careful ;o)
            
    print(f"Percent Growth: {pg if pg else 'No data yet':{'.05f' if pg else ''}}")
            
    # you need to put '.05f' into a string for this to work and not complain


            Output:



            Percent growth: 2.56235
            
Percent growth: 0.90000
            
Percent growth: No data yet






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Mar 1 at 19:04

























            answered Mar 1 at 18:50









            Patrick ArtnerPatrick Artner

            25.2k62444




            25.2k62444








            • 1





              I love how hacky this is.

              – NoSplitSherlock
              Mar 1 at 19:02














            • 1





              I love how hacky this is.

              – NoSplitSherlock
              Mar 1 at 19:02








            1




            1





            I love how hacky this is.

            – NoSplitSherlock
            Mar 1 at 19:02





            I love how hacky this is.

            – NoSplitSherlock
            Mar 1 at 19:02


















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