格式化字符串保留小数python
时间: 2023-10-15 19:28:00 浏览: 158
在Python中,有几种方法可以格式化字符串来保留小数位数。
方法一:使用百分号格式化字符串。可以使用"%.2f"的格式来保留两位小数。例如:
```python
a = 3.1415926
print("%.2f" % a) # 输出结果为3.14
```
方法二:使用round内置函数来进行四舍五入处理。例如:
```python
s = 12.345
a = round(s, 2)
print(a) # 输出结果为12.35
```
方法三:使用decimal模块来进行精确计算和保留小数。例如:
```python
from decimal import Decimal
s = 12.3445
a = Decimal(s).quantize(Decimal('0.00'))
print(a) # 输出结果为12.34
```
方法四:使用切片来截取小数位数。例如:
```python
s = 12.345
a = str(s).split('.')
s1 = a + '.' + a<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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