Common ValueError raised when formatting complex numbers

[robtovey]

Describe the bug
Attempts to format the number 1-1j will result in a ValueError raised. This is due to a feature (bug?) in CPython:

x = 1+-1j # this does not raise an error
x = complex("1+-1j") # this raises a ValueError

Unfortunately this case must be hit quite frequently in these lines of code:

deepdiff/deepdiff/helper.py

Lines 431 to 446 in ecc823a

	elif isinstance(number, only_complex_number): # type: ignore
	# Case for complex numbers.
	number = number.__class__(
	"{real}+{imag}j".format( # type: ignore
	real=number_to_string(
	number=number.real, # type: ignore
	significant_digits=significant_digits,
	number_format_notation=number_format_notation
	),
	imag=number_to_string(
	number=number.imag, # type: ignore
	significant_digits=significant_digits,
	number_format_notation=number_format_notation
	)
	) # type: ignore
	)

To Reproduce

from deepdiff.helper import number_to_string
print(number_to_string(1-1j, significant_digits=1)) # raises a ValueError

Expected behavior
I expect this to print 1.0-1.0j, not raise an error!

I am using

• Python 3.12
• DeepDiff on main