如何修复：ValueError: no enough values to unpack (expected 2, got 1)

Question

我正在尝试绘制图表 并不断收到错误 ValueError: not enough values to unpack (expected 2, got 1)

#turning csv into array
``AL_Force=data1["Force (kN)"].to_numpy()
`Al_Strain_p=data1["Tensile strain (Strain 1)(%)"] #strain in %
``#Calculating Stress=Force/Area

AL_stress=AL_Force/AL_a
#changing strain % into a fraction 
AL_Strain=Al_Strain_p/100

                         #High Carbon Steel data#
#turning csv into an array 
HC_Force=data3["Force(kN)"].to_numpy()
HC_Strain_p=data3["Tensile strain (Strain 1)(%)"].to_numpy()
#calcuting stress
HC_Stress=HC_Force/HC_a
#changing strain % into a fraction 
HC_Strain=HC_Strain_p/100
                            #Low Carbon Steel Data#
LC_Force=data2["Force(kN)"].to_numpy()
LC_Strain_p=data2["Tensile strain (Strain 1)(%)"]
#calculating stress
LC_Stress=LC_Force/LC_a
#changing strain % into a fraction 
LC_Strain=LC_Strain_p/100

#plotting graph
fig,ax1=plt.plot(AL_stress,AL_Strain,linestyle='-',color='black')

Answer 1

您的问题是您的最后一行。 plt.plot() 返回单个对象，但您将其设置为两个变量：fig 和 ax1。改为：

fig = plt.plot(AL_stress, AL_Strain, linestyle='-',color='black')

如果您想研究如何使用子图（为什么要使用 ax），请查看此other answer。