---input---
f'{math.pi=!f:.2f}'

---tokens---
'f'           Literal.String.Affix
"'"           Literal.String.Single
'{'           Literal.String.Interpol
'math'        Name
'.'           Operator
'pi'          Name
'=!f:'        Literal.String.Interpol
'.2f'         Literal.String.Single
'}'           Literal.String.Interpol
"'"           Literal.String.Single
'\n'          Text.Whitespace