matplotlib - Python combining the format method with long strings that use LaTeX -

i'm trying write long string several latex commands , variables image. i'm having trouble setting arbitrary precision variables while maintaining latex formatting.

here's mwe:

import matplotlib.pyplot plt # define variables names , values. xn, yn, cod, prec, prec2 = 'r', 'p', 'abc', 2, 4 ccl = [546.35642, 6785.35416] ect = [12.5235, 13.643241]  plt.figure()  text1 = "${}_{t} = {:.{p}f} \pm {:.{p}f} {c}$".format(xn, ccl[0], ect[0], c=cod, p=prec) text2 = "${}_{t} = {:.{p}f} \pm {:.{p}f} {c}$".format(yn, ccl[1], ect[1], c=cod, p=prec2)  text = text1 + '\n' + text2 plt.text(0.5, 0.5, text) plt.savefig('format_test.png', dpi=150) 

this throws error keyerror: 't' since recognizing sub-index {t} variable. if instead use:

text1 = "${{{a}}}_{t} = {:.{p}f} \pm {:.{p}f} {c}$".format(a=xn, ccl[0], ect[0], c=cod, p=prec) text2 = "${{{a}}}_{t} = {:.{p}f} \pm {:.{p}f} {c}$".format(b=yn, ccl[1], ect[1], c=cod, p=prec2) 

i syntaxerror: non-keyword arg after keyword arg since have ccl[0], ect[0] variables in format defined after a=xn (same second text line).

notice prec , prec2 values @ end of format determines number of decimal places number have when printed. need pass variable because not fixed, can't set fixed value replace {:.{p}f}.

how can make these string lines work while keeping latex formatting , different precision needed?

i think need curly brace around t. works me:

text1 = r"${}_{{t}} = {:.{p}f} \pm {:.{p}f} {c}$".format(xn, ccl[0], ect[0], c=cod, p=prec) text2 = r"${}_{{t}} = {:.{p}f} \pm {:.{p}f} {c}$".format(yn, ccl[1], ect[1], c=cod, p=prec2) 

adding double curly brace means treated literally, not part of python format syntax