Learn how to round a number to 2 decimal places in Python for improved precision using techniques like round(), format(), and string formatting techniques.
print(round(3.447444,2))>>3.45 fromdecimalimport Decimal print(Decimal('0.3') + Decimal('0.9'))>>1.2 importmath#向上取整math.ceil( x )importmath#向下取整math.floor( x )
Decimal还可以用来限定数据的总位数。 round是截断(直接舍弃其余位)还是四舍五入原则,和版本有关系。 举例: # 默认对十分位四舍五入,也就是四舍五入成整数print(round(1.23))# 1print(round(1.27))# 1# 小数出现.5,返回离他们最近的偶数print(round(1.5))# 2print(round(2.5))# 2print(round(3.5))# ...
Round to nearest, ties to even – rounds to the nearest value; if the number falls midway it ...
下面的代码中对数据表进行描述统计,并使用 round 函数设置结果显示的小数位。并对结果数据进行转置。 1#数据表描述性统计 2df_inner.describe().round(2).T 标准差Python 中的 Std 函数用来接算特定数据列的标准差。 1#标准差 2df_inner['price'].std() 31523.3516556155596 协方差Excel 中的数据分析功能中...
Expression: round(!area!, 2) 通过math 模块将米转换成英尺。 以转换值为底,以 2 为指数进行幂运算,然后再乘以 area。 Expression: MetersToFeet((float(!shape.area!))) Code Block: import math def MetersToFeet(area): return math.pow(3.2808, 2) * area ...
Nearest points Snapping Shared paths Splitting Substring Prepared Geometry Operations Diagnostics Polylabel STR-packed R-tree Interoperation Well-Known Formats Numpy and Python Arrays Python Geo Interface Performance Introduction Shapely是通过Python的ctypes模块,对平面特征进行集合理论分析和操作,使用的函数来自于GEO...
>>> # Round coordinates to 3 decimal places >>> bbox = shapes[3].bbox >>> ['%.3f' % coord for coord in bbox] ['-122.486', '37.787', '-122.446', '37.811'] parts: Parts simply group collections of points into shapes. If the shape record has multiple parts this attribute ...
def excepter(f): i = 0 t1 = time.time() def wrapper(): try: f() except Exception as e: nonlocal i i += 1 print(f'{e.args[0]}: {i}') t2 = time.time() if i == n: print(f'spending time:{round(t2-t1,2)}') return wrapper 22 global 声明全局变量 先回答为什么要有...
Decimal numbers can be represented exactly, unlike floats where '1.1 + 2.2 != 3.3'. Their precision can be adjusted with 'decimal.getcontext().prec = <int>'. Basic Functions <num> = pow(<num>, <num>) # Or: <num> ** <num> <num> = abs(<num>) <int> = round(<num>) <num...