如何检查dataframe中是否有缺失值？

df = pd.read_csv('https://raw.githubusercontent.com/selva86/datasets/master/Cars93_miss.csv')

# 若有缺失值，则为Ture
df.isnull().values.any()

#>	True
9. 如何统计dataframe的每列中缺失值的个数
df = pd.read_csv('https://raw.githubusercontent.com/selva86/datasets/master/Cars93_miss.csv')

# 获取每列的缺失值个数
n_missings_each_col = df.apply(lambda x: x.isnull().sum())
print(n_missings_each_col.head())

#>	Manufacturer    4
	Model           1
	Type            3
	Min.Price       7
	Price           2
	dtype: int64