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You could do it as is shown below using the <code>str.format()</code> method: <pre class="lang-none prettyprint-override"><code>>>> n = 3.4+2.3j >>> n (3.4+2.3j) >>> '({0.real:.2f} + {0.imag:.2f}i)'.format(n) '(3.40 + 2.30i)' >>> '({c.real:.2f} + {c.imag:.2f}i)'.format(c=n) '(3.40 + 2.30i)' </code></pre> To make it handle both positive and negative imaginary portions properly, you would need a (even more) complicated formatting operation: <pre class="lang-none prettyprint-override"><code>>>> n = 3.4-2.3j >>> n (3.4-2.3j) >>> '({0:.2f} {1} {2:.2f}i)'.format(n.real, '+-'[n.imag < 0], abs(n.imag)) '(3.40 - 2.30i)' </code></pre> Update - Easier Way Although you cannot use <code>f</code> as a presentation type for complex numbers using the string formatting operator <code>%</code>: <pre><code>n1 = 3.4+2.3j n2 = 3.4-2.3j try: print('test: %.2f' % n1) except Exception as exc: print('{}: {}'.format(type(exc).__name__, exc)) </code></pre> Output: <pre class="lang-none prettyprint-override"><code> TypeError: float argument required, not complex </code></pre> You can however use it with complex numbers via the <code>str.format()</code> method. This isn't explicitly documented, but is implied by the <a href="https://docs.python.org/3/library/string.html?highlight=formatting#format-specification-mini-language" rel="nofollow noreferrer">Format Specification Mini-Language</a> documentation which just says: <blockquote> <code>'f'</code>  Fixed point. Displays the number as a fixed-point number. The default precision is <code>6</code>. </blockquote> . . .so it's easy to overlook. In concrete terms, the following works in both Python 2.7.14 and 3.4.6: <pre><code>print('n1: {:.2f}'.format(n1)) print('n2: {:.2f}'.format(n2)) </code></pre> Output: <pre class="lang-none prettyprint-override"><code>n1: 3.10+4.20j n2: 3.10-4.20j </code></pre> This doesn't give you quite the control the code in my original answer does, but it's certainly much more concise (and handles both positive and negative imaginary parts automatically).
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