python初学者请问大神们stock_code_list.append(f.split('.csv')[0])这句后边那个[0]是什么意思，为什么要加？

刚接触Python,对于这题很困惑，希望大神可以解答一下。Verify that no name is repeated in `members` by writing some code that prints `"Seems OK"` if no name is repeated, or prints out a name if it is repeated.members = ["Arnetta","Thomasena","Arnetta","T...

Python中DataFrame内的循环问题 from pandas import Series, DataFrame df = DataFrame({'one':[1, 2, 3], 'two':[3, 4, 5]}, index=[1, 2, 3]) 希望比较每行'one'和'two'中两数的大小，若'one'中的数大于'two'中的数，则输出1，否则输出0，同时将输出结果也添加到df...

萌新求问，可以用广义矩估计GMM来估计copula函数参数吗，如果是markov-switching的呢？

chunker=pd.read_csv("ch06\\ex2.csv",engine='python',chunksize=100)tot=pd.Series([])for piece in chunker:    tot=tot.add(piece['key'].value_counts(),fill_value=0)tot=tot.sort_value(ascending=False)ValueError: I/O operation on...

例如有如下数据No&nbsp; &nbsp;Value1&nbsp; &nbsp; &nbsp; &nbsp;52&nbsp; &nbsp; &nbsp; &nbsp;33&nbsp; &nbsp; &nbsp; &nbsp;44&nbsp; &nbsp; &nbsp; &nbsp;15&nbsp; &nbsp; &nbsp; &nbsp;6想要将这个数据转换成相关性二进制矩阵，数值相差<=1，视为1，else为0，&nbs...

怎样用R或者java 生成符合幂律分布（power law）的随机数列