How to use 'fstring format float' in Python

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def format_float(x):
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    try:
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        return "%10.5f" % x
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    except:
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        return str(x)

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def float_str(f, min_digits=2, max_digits=6):
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    """
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    Returns a string representing a float, where the number of
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    significant digits is min_digits unless it takes more digits
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    to hit a non-zero digit (and the number is 0 < x < 1).
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    We stop looking for a non-zero digit after max_digits.
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    """
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    if f >= 1 or f <= 0:
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        return str(round_float(f, min_digits))
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    start_str = str(round_float(f, max_digits))
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    digits = start_str.split(".")[1]
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    non_zero_indices = []
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    for i, digit in enumerate(digits):
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        if digit != "0":
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            non_zero_indices.append(i + 1)
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    # Only saw 0s.
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    if len(non_zero_indices) == 0:
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        num_digits = min_digits
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    else:
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        # Of the non-zero digits, pick the num_digit'th of those (including any zeros)
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        min_non_zero_indices = range(non_zero_indices[0], non_zero_indices[-1] + 1)[:min_digits]
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        num_digits = min_non_zero_indices[-1]
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    return str(round_float(f, num_digits))