pandas通过字典生成dataframe的方法步骤

> import pandas as pd
> a = [1,2,3,4,5]
> b = ["a","b","c"]
> c = 1
> df = pd.DataFrame({"A":a,"B":b,"C":c})
Traceback (most recent call last):
ValueError: arrays must all be same length
> df = pd.DataFrame([a,b]) # 作为list输入，list的元素必须也是list，加入c就错误
> df
  0 1 2  3  4
0 1 2 3 4.0 5.0
1 a b c NaN NaN

# 统一一下字典每个元素值的长度
> b = ["a","b","c","d","e"]
> c = ("232","sdf","345","asd",1)
> df = pd.DataFrame({"A":a,"B":b,"C":c})
> df
  A B  C
0 1 a 232
1 2 b sdf
2 3 c 345
3 4 d asd
4 5 e  1

> d1 = {"A":1,"B":2,"C":3}
> d2 = {"A":"a","B":"b",}
> d3 = {"A":(1,2),"B":"ab","C":3}
> li = [d1,d2,d3]
> df = pd.DataFrame(li)
> df
    A  B  C
0    1  2 3.0
1    a  b NaN
2 (1, 2) ab 3.0