系统:Windows 7 语言版本:Anaconda3-4.3.0.1-Windows-x86_64 编辑器:pycharm-community-2016.3.2
Part 1:示例
DataFrame
,有4列["quality_1", "measure_value", "up_tol", "down_tol"]
up_measure
中每个值=列up_tol
-列measure_value
measure_down
中每个值=列measure_value
-列down_tol
执行结果
Part 2:代码
import pandas as pd
dict_1 = {"quality_1": ["pos_1", "pos_2", "pos_3", "pos_4", "pos_5"],
"measure_value": [6, 4, 6, 3.5, 2.5],
"up_tol": [5, 5, 3, 3, 2],
"down_tol": [-5, -5, -3, -3, 2]}
df = pd.DataFrame(dict_1, columns=["quality_1", "measure_value", "up_tol", "down_tol"])
df["up_measure"] = df["up_tol"] - df["measure_value"]
df["measure_down"] = df["measure_value"] - df["down_tol"]
print(df)
代码截图
Part 3:部分代码解读
df["up_measure"] = df["up_tol"] - df["measure_value"]
,两列相减,生成一个新的列