当我从我的数据库中检索数据时,我想检查这些值是否可用(如果没有,这意味着数据库以某种方式损坏了,因为mandatories字段丢失了) 我目前的实现如下: self.foo = myDbRef.get(myDbRef.get('bar')self.plop = myDbRef.get('plop')
if self.foo is Noneor self.bar is None or
import pandas as pdall_air = pd.read_csv('small.csv')
#all_air['C'].fillna(-1) #pandas will take NaN as 0 in calculation, right?print all_air['C']
if n