pandas通过字典生成dataframe的方法步骤
1、将一个字典输入:
该字典必须满足:value是一个list类型的元素,且每一个key对应的value长度都相同:
(以该字典的key为columns)
>>>importpandasaspd >>>a=[1,2,3,4,5] >>>b=["a","b","c"] >>>c=1 >>>df=pd.DataFrame({"A":a,"B":b,"C":c}) Traceback(mostrecentcalllast): ValueError:arraysmustallbesamelength >>>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 01234 01234.05.0 1abcNaNNaN #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 ABC 01a232 12bsdf 23c345 34dasd 45e1
2、将多个key相同的字典列输入:
输入为一个list,该list各个元素为dict,且key可以不同(以含最多的key的字典的key为columns):
>>>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 ABC 0123.0 1abNaN 2(1,2)ab3.0
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