Python：如何循环代码，以便它一个接一个地从csv文件中提取列？

我需要帮助的问题是：如何循环代码，以便它一个接一个地从csv文件中提取列？我的excel文件中，r和m当时每个都有1列（具有相同数量的单元格）。我希望代码以与现在相同的方式执行计算，然后跳转到csv m和r中的第二列并执行相同的计算-我需要能够对所有列重复此过程（我有两个文件中大约1300列）。您能建议如何解决吗？

编码

import math
import numpy

"""
Note - for some of the metrics the absolute value is returns. This is because if the risk (loss) is higher we want to
discount the expected excess return from the portfolio by a higher amount. Therefore risk should be positive.
"""


def vol(returns):
    # Return the standard deviation of returns
    return numpy.std(returns)


def beta(returns, market):
    # Create a matrix of [returns, market]
    m = numpy.matrix([returns, market])
    # Return the covariance of m divided by the standard deviation of the market returns
    return numpy.cov(m)[0][1] / numpy.std(market)


def lpm(returns, threshold, order):
    # This method returns a lower partial moment of the returns
    # Create an array he same length as returns containing the minimum return threshold
    threshold_array = numpy.empty(len(returns))
    threshold_array.fill(threshold)
    # Calculate the difference between the threshold and the returns
    diff = threshold_array - returns
    # Set the minimum of each to 0
    diff = diff.clip(min=0)
    # Return the sum of the different to the power of order
    return numpy.sum(diff ** order) / len(returns)


def hpm(returns, threshold, order):
    # This method returns a higher partial moment of the returns
    # Create an array he same length as returns containing the minimum return threshold
    threshold_array = numpy.empty(len(returns))
    threshold_array.fill(threshold)
    # Calculate the difference between the returns and the threshold
    diff = returns - threshold_array
    # Set the minimum of each to 0
    diff = diff.clip(min=0)
    # Return the sum of the different to the power of order
    return numpy.sum(diff ** order) / len(returns)


def var(returns, alpha):
    # This method calculates the historical simulation var of the returns
    sorted_returns = numpy.sort(returns)
    # Calculate the index associated with alpha
    index = int(alpha * len(sorted_returns))
    # VaR should be positive
    return abs(sorted_returns[index])


def cvar(returns, alpha):
    # This method calculates the condition VaR of the returns
    sorted_returns = numpy.sort(returns)
    # Calculate the index associated with alpha
    index = int(alpha * len(sorted_returns))
    # Calculate the total VaR beyond alpha
    sum_var = sorted_returns[0]
    for i in range(1, index):
        sum_var += sorted_returns[i]
    # Return the average VaR
    # CVaR should be positive
    return abs(sum_var / index)


def prices(returns, base):
    # Converts returns into prices
    s = [base]
    for i in range(len(returns)):
        s.append(base * (1 + returns[i]))
    return numpy.array(s)


def dd(returns, tau):
    # Returns the draw-down given time period tau
    values = prices(returns, 100)
    pos = len(values) - 1
    pre = pos - tau
    drawdown = float('+inf')
    # Find the maximum drawdown given tau
    while pre >= 0:
        dd_i = (values[pos] / values[pre]) - 1
        if dd_i < drawdown:
            drawdown = dd_i
        pos, pre = pos - 1, pre - 1
    # Drawdown should be positive
    return abs(drawdown)


def max_dd(returns):
    # Returns the maximum draw-down for any tau in (0, T) where T is the length of the return series
    max_drawdown = float('-inf')
    for i in range(0, len(returns)):
        drawdown_i = dd(returns, i)
        if drawdown_i > max_drawdown:
            max_drawdown = drawdown_i
    # Max draw-down should be positive
    return abs(max_drawdown)


def average_dd(returns, periods):
    # Returns the average maximum drawdown over n periods
    drawdowns = []
    for i in range(0, len(returns)):
        drawdown_i = dd(returns, i)
        drawdowns.append(drawdown_i)
    drawdowns = sorted(drawdowns)
    total_dd = abs(drawdowns[0])
    for i in range(1, periods):
        total_dd += abs(drawdowns[i])
    return total_dd / periods


def average_dd_squared(returns, periods):
    # Returns the average maximum drawdown squared over n periods
    drawdowns = []
    for i in range(0, len(returns)):
        drawdown_i = math.pow(dd(returns, i), 2.0)
        drawdowns.append(drawdown_i)
    drawdowns = sorted(drawdowns)
    total_dd = abs(drawdowns[0])
    for i in range(1, periods):
        total_dd += abs(drawdowns[i])
    return total_dd / periods


def treynor_ratio(er, returns, market, rf):
    return (er - rf) / beta(returns, market)


def sharpe_ratio(er, returns, rf):
    return (er - rf) / vol(returns)


def information_ratio(returns, benchmark):
    diff = returns - benchmark
    return numpy.mean(diff) / vol(diff)


def modigliani_ratio(er, returns, benchmark, rf):
    np_rf = numpy.empty(len(returns))
    np_rf.fill(rf)
    rdiff = returns - np_rf
    bdiff = benchmark - np_rf
    return (er - rf) * (vol(rdiff) / vol(bdiff)) + rf


def excess_var(er, returns, rf, alpha):
    return (er - rf) / var(returns, alpha)


def conditional_sharpe_ratio(er, returns, rf, alpha):
    return (er - rf) / cvar(returns, alpha)


def omega_ratio(er, returns, rf, target=0):
    return (er - rf) / lpm(returns, target, 1)


def sortino_ratio(er, returns, rf, target=0):
    return (er - rf) / math.sqrt(lpm(returns, target, 2))


def kappa_three_ratio(er, returns, rf, target=0):
    return (er - rf) / math.pow(lpm(returns, target, 3), float(1/3))


def gain_loss_ratio(returns, target=0):
    return hpm(returns, target, 1) / lpm(returns, target, 1)


def upside_potential_ratio(returns, target=0):
    return hpm(returns, target, 1) / math.sqrt(lpm(returns, target, 2))


def calmar_ratio(er, returns, rf):
    return (er - rf) / max_dd(returns)


def sterling_ration(er, returns, rf, periods):
    return (er - rf) / average_dd(returns, periods)


def burke_ratio(er, returns, rf, periods):
    return (er - rf) / math.sqrt(average_dd_squared(returns, periods))


def test_risk_metrics(r, m):
    print("vol =", vol(r))
    print("beta =", beta(r, m))
    print("hpm(0.0)_1 =", hpm(r, 0.0, 1))
    print("lpm(0.0)_1 =", lpm(r, 0.0, 1))
    print("VaR(0.05) =", var(r, 0.05))
    print("CVaR(0.05) =", cvar(r, 0.05))
    print("Drawdown(5) =", dd(r, 5))
    print("Max Drawdown =", max_dd(r))


def test_risk_adjusted_metrics(r, m):
    # Returns from the portfolio (r) and market (m)
    # Expected return
    e = numpy.mean(r)
    # Risk free rate
    f = 0.06
    # Risk-adjusted return based on Volatility
    print("Treynor Ratio =", treynor_ratio(e, r, m, f))
    print("Sharpe Ratio =", sharpe_ratio(e, r, f))
    print("Information Ratio =", information_r
          atio(r, m))
    # Risk-adjusted return based on Value at Risk
    print("Excess VaR =", excess_var(e, r, f, 0.05))
    print("Conditional Sharpe Ratio =", conditional_sharpe_ratio(e, r, f, 0.05))
    # Risk-adjusted return based on Lower Partial Moments
    print("Omega Ratio =", omega_ratio(e, r, f))
    print("Sortino Ratio =", sortino_ratio(e, r, f))
    print("Kappa 3 Ratio =", kappa_three_ratio(e, r, f))
    print("Gain Loss Ratio =", gain_loss_ratio(r))
    print("Upside Potential Ratio =", upside_potential_ratio(r))
    # Risk-adjusted return based on Drawdown risk
    print("Calmar Ratio =", calmar_ratio(e, r, f))
    print("Sterling Ratio =", sterling_ration(e, r, f, 5))
    print("Burke Ratio =", burke_ratio(e, r, f, 5))


if __name__ == "__main__":
    import csv

    # load r
    with open(r'C:\Users\Lenovo\Documents\r.csv') as csvfile:  # change your filename here
        r = numpy.array([float(x[0]) for x in csv.reader(csvfile)])

    # load m
    with open(r'C:\Users\Lenovo\Documents\m.csv') as csvfile:  # change your filename here
        m = numpy.array([float(x[0]) for x in csv.reader(csvfile)])

    test_risk_metrics(r, m)
    test_risk_adjusted_metrics(r, m)