擅长:python、mysql、java
<p><code>0.5</code>尽可能精确。如果要在打印期间确保固定宽度,请使用<a href="https://docs.python.org/3/library/string.html#format-specification-mini-language" rel="nofollow noreferrer">string formatting</a></p>
<pre><code>a = decimal.Decimal(2)/decimal.Decimal(4)
print(f'{a:1.4f}') #Python v3.6+
print('{:1.4f}'.format(a))
>>>
0.5000
0.5000
</code></pre>
<hr/>
<p><a href="https://docs.python.org/3/reference/lexical_analysis.html#formatted-string-literals" rel="nofollow noreferrer">Formatted String Literals (new in version 3.6)</a></p>