How to use 'fstring format float' in Python

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48def format_float(x):
49 try:
50 return "%10.5f" % x
51 except:
52 return str(x)
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24def float_str(f, min_digits=2, max_digits=6):
25 """
26 Returns a string representing a float, where the number of
27 significant digits is min_digits unless it takes more digits
28 to hit a non-zero digit (and the number is 0 < x < 1).
29 We stop looking for a non-zero digit after max_digits.
30 """
31 if f >= 1 or f <= 0:
32 return str(round_float(f, min_digits))
33 start_str = str(round_float(f, max_digits))
34 digits = start_str.split(".")[1]
35 non_zero_indices = []
36 for i, digit in enumerate(digits):
37 if digit != "0":
38 non_zero_indices.append(i + 1)
39 # Only saw 0s.
40 if len(non_zero_indices) == 0:
41 num_digits = min_digits
42 else:
43 # Of the non-zero digits, pick the num_digit'th of those (including any zeros)
44 min_non_zero_indices = range(non_zero_indices[0], non_zero_indices[-1] + 1)[:min_digits]
45 num_digits = min_non_zero_indices[-1]
46 return str(round_float(f, num_digits))

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