在我在datagridview中加载数据后的表单加载事件之后，我调用此函数来更改付费开销为是的那些行的颜色但它在行上给出了null引用异常
PaidStatus = ExpensesDataGridView.Rows [i] .Cells [4] .Value.ToString（）;
case答案 0 :(得分：0)
Cells start from a 0th index, meaning that the 4th cell would be at import matplotlib.pyplot as plt
import plotly.plotly as py
import pandas as pd
import plotly.graph_objs as go
# read in LEC
LLEC = pd.read_csv('LLEC_1.csv').transpose()
RLEC = pd.read_csv('RLEC_2.csv').transpose()
#read in DGCA3
LDGCA3=pd.read_csv('LDGCA3_13.csv').transpose()
RDGCA3 = pd.read_csv('RDGCA3_14.csv').transpose()
def plot_betas_left(betaNum):
betaNum = int(betaNum)
#plot betas for both ROIs. start with LEC
ax = LLEC[betaNum].plot()
# add DGCA3
LDGCA3[betaNum].plot(ax=ax)
# label axes
ax.set_xlabel("precise beta number (0 is first)")
ax.set_ylabel("beta coefficient value")
# inset legend
ax.legend(['LEC', 'DGCA3'])
plt.savefig('Subj%s_left_LEC_DGCA3.png' % betaNum+1)
plot_betas(3)
index . In the same way, the row and column indices start from 0 as well but your loop starts from an python get-pip.py so I suggest you change that as well to: get-pip.py
Or use [3] :
int i = 1