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

How do I check if a string is a number (float)?How do I parse a string to a float or int in Python?How to determine a Python variable's type?How do I trim whitespace from a Python string?How to check if type of a variable is string?How to lowercase a string in Python?How to read a text file into a string variable and strip newlines?SQLAlchemy Turning Floats Into Strings in SQL?Dictionary true/false errorConvert float to string without scientific notation and false precision

8

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

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I formulated the question this way so it was clear no matter what condition it fails to even execute.
  
  – NoSplitSherlock
  12 hours ago
  

  
  
  
  

add a comment | 

8

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

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I formulated the question this way so it was clear no matter what condition it fails to even execute.
  
  – NoSplitSherlock
  12 hours ago
  

  
  
  
  

add a comment | 

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

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

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

Percent growth : 0.19824077757643577

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

0.198

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

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

share|improve this question

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

share|improve this question

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

asked 14 hours ago

NoSplitSherlockNoSplitSherlock

1128

3 Answers
3

active

oldest

votes

9

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

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

• 
  
  
  

  
  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
  14 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  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
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.
  
  – Nikolas Stevenson-Molnar
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @PatrickArtner Absolutely, that works too.
  
  – Nikolas Stevenson-Molnar
  13 hours ago
  

  
  
  
  

add a comment | 

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

edited 13 hours ago

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I love how hacky this is.
  
  – NoSplitSherlock
  13 hours ago
  

  
  
  
  

add a comment | 

1

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

answered 14 hours ago

IdlehandsIdlehands

5,6551620

add a comment | 

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9

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

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

• 
  
  
  

  
  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
  14 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  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
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.
  
  – Nikolas Stevenson-Molnar
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @PatrickArtner Absolutely, that works too.
  
  – Nikolas Stevenson-Molnar
  13 hours ago
  

  
  
  
  

add a comment | 

9

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

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

• 
  
  
  

  
  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
  14 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  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
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @PatrickArtner see the OP’s question and code sample. The if True is a stand in for any conditional.
  
  – Nikolas Stevenson-Molnar
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @PatrickArtner Absolutely, that works too.
  
  – Nikolas Stevenson-Molnar
  13 hours ago
  

  
  
  
  

add a comment | 

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

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

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

share|improve this answer

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

answered 14 hours ago

Nikolas Stevenson-MolnarNikolas Stevenson-Molnar

1,246714

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

edited 13 hours ago

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I love how hacky this is.
  
  – NoSplitSherlock
  13 hours ago
  

  
  
  
  

add a comment | 

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

edited 13 hours ago

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I love how hacky this is.
  
  – NoSplitSherlock
  13 hours ago
  

  
  
  
  

add a comment | 

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

edited 13 hours ago

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

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

Percent growth: 2.56235

Percent growth: 0.90000

Percent growth: No data yet

share|improve this answer

edited 13 hours ago

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

answered 13 hours ago

Patrick ArtnerPatrick Artner

24.9k62443

1

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

answered 14 hours ago

IdlehandsIdlehands

5,6551620

add a comment | 

1

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

answered 14 hours ago

IdlehandsIdlehands

5,6551620

add a comment | 

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

answered 14 hours ago

IdlehandsIdlehands

5,6551620

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

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

share|improve this answer

answered 14 hours ago

IdlehandsIdlehands

5,6551620

answered 14 hours ago

IdlehandsIdlehands

5,6551620

answered 14 hours ago

IdlehandsIdlehands

5,6551620