62 lines
1.2 KiB
Markdown
62 lines
1.2 KiB
Markdown
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---
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title: Python Complex Numbers
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localeTitle: Python复杂数字
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---
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复数具有实部和虚部，每个部分由浮点数表示。
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可以使用虚构的文字创建复数的虚部，这会产生一个复数，其实部为`0.0` ：
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```python
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>>> a = 3.5j
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>>> type(a)
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<class 'complex'>
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>>> print(a)
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3.5j
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>>> a.real
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0.0
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>>> a.imag
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3.5
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```
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不存在用于创建具有非零实部和虚部的复数的文字。要创建非零实部复数，请将虚构文字添加到浮点数：
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```python
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>>> a = 1.1 + 3.5j
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>>> type(a)
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<class 'complex'>
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>>> print(a)
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(1.1+3.5j)
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>>> a.real
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1.1
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>>> a.imag
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3.5
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```
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或者使用[复杂的构造函数](https://docs.python.org/3/library/functions.html#complex) 。
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```python
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class complex([real[, imag]])
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```
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用于调用复杂构造函数的参数可以是任一参数的数字（包括`complex` ）类型：
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```python
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>>> complex(1, 1)
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(1+1j)
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>>> complex(1j, 1j)
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(-1+1j)
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>>> complex(1.1, 3.5)
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(1.1+3.5j)
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>>> complex(1.1)
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(1.1+0j)
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>>> complex(0, 3.5)
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3.5j
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```
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`string`也可以用作参数。如果将字符串用作参数，则不允许使用第二个参数
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```python
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>>> complex("1.1+3.5j")
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(1.1+3.5j)
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```
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