Initial Query

Python format {sdf} to 3 decimal digits

LLM Generation

Query

Python format {sdf} to 3 decimal digits

Output

Okay, let's assume `sdf` is a variable holding a floating-point number in Python. Here are the common ways to format it to 3 decimal places: **1. Using f-strings (Recommended for Python 3.6+)** This is the most modern and often the most readable way. 

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sdf = 12.3456789 
formatted_sdf = f"{sdf:.3f}" 
print(formatted_sdf)  # Output: 12.346

sdf = 10.0
formatted_sdf = f"{sdf:.3f}"
print(formatted_sdf)  # Output: 10.000 

sdf = 12.3451
formatted_sdf = f"{sdf:.3f}"
print(formatted_sdf) # Output: 12.345
* `:` introduces the format specifier. * `.3` specifies the precision (3 digits after the decimal point). * `f` indicates fixed-point notation. **2. Using the `str.format()` method** This works in Python 2.7 and all Python 3 versions. 
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sdf = 12.3456789
formatted_sdf = "{:.3f}".format(sdf)
print(formatted_sdf)  # Output: 12.346

sdf = 10.0
formatted_sdf = "{:.3f}".format(sdf)
print(formatted_sdf)  # Output: 10.000
* The format specifier `:.3f` is placed inside the curly braces `{}`. **3. Using the `%` operator (Older style)** This is the older C-style formatting. While it still works, f-strings or `str.format()` are generally preferred in modern Python. 
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sdf = 12.3456789
formatted_sdf = "%.3f" % sdf
print(formatted_sdf)  # Output: 12.346

sdf = 10.0
formatted_sdf = "%.3f" % sdf
print(formatted_sdf)  # Output: 10.000
* `%` inside the string acts as a placeholder. * `.3` specifies the precision. * `f` indicates a floating-point number. * The `%` operator after the string connects the format string to the variable(s). **Important Note on Rounding:** All these methods perform **rounding** (typically round half to even, Python's default) when formatting, not just truncation. As seen in the examples, `12.3456789` rounds *up* to `12.346`.

Substring Evaluation

Testing if the previous output contains the string :.3f}: True