这是我的代码:
while counter <= len(titles):
currenttime = [perc[counter], fails[counter], titles[counter]]
print(currenttime)
for percent, fail, title in currenttime:
当我运行它时,我得到一个值错误显示
ValueError: not enough values to unpack (expected 3, got 2)
但是当我打印当前时间时,我明白了
['67', '1', 'subsection']
对我来说,这看起来像3个值,但显然我错了,有人可以启发我吗?我环顾四周,但发现没有好的答案。任何帮助将不胜感激。谢谢
代码上下文:
n = 0
perc = list()
while n < len(piedata):
perc.append(piedata[n+2])
n += 3
print (perc)
n = 0
fails = list()
while n < len(piedata):
fails.append(piedata[n+1])
n += 3
print(fails)
n = 0
titles = list()
while n < len(piedata):
titles.append(piedata[n])
n += 3
print(titles)
counter = 0
while counter <= len(titles):
currenttime = [perc[counter], fails[counter], titles[counter]]
print(currenttime)
for percent, fail, title in currenttime:
piedata = [percent, (100-percent)]
fig = matplotlib.figure.Figure(figsize=(5, 5))
ax = fig.add_subplot(111)
ax.pie(piedata) # this is the information that the circle diagram will be made out of
ax.legend([('amount of attempts:', NOTT), ('amount of fails', fail)])
circle = matplotlib.patches.Circle((0, 0), 0.7, color='white')
ax.add_artist(circle)
# this is the code for actually putting the circle diagram/pie chart on the screen
canvas = FigureCanvasTkAgg(fig, master=window)
canvas.get_tk_widget().pack()
canvas.draw()
Label(window, text=(title, title), bg='light blue').pack()
counter += 1
window.mainloop()
print(percent)
print(fail)
该声明:
for percent, fail, title in currenttime:
意味着将currenttime
列表中的每个项目解压缩为一个序列,然而currenttime
列表中的每个项目只是一个字符串,它解包为字符,其中第一个项目只有两个,导致“没有足够的值来解包(预期3,得到2)“错误。
为了您的目的,您应该简单地压缩3个列表并迭代zip
生成器而不是带有计数器和内部while
循环的for
循环:
for percent, fail, title in zip(perc, fails, titles):
piedata = [percent, (100 - percent)]
fig = matplotlib.figure.Figure(figsize=(5, 5))
ax = fig.add_subplot(111)
ax.pie(piedata) # this is the information that the circle diagram will be made out of
ax.legend([('amount of attempts:', NOTT), ('amount of fails', fail)])
circle = matplotlib.patches.Circle((0, 0), 0.7, color='white')
ax.add_artist(circle)
# this is the code for actually putting the circle diagram/pie chart on the screen
canvas = FigureCanvasTkAgg(fig, master=window)
canvas.get_tk_widget().pack()
canvas.draw()
Label(window, text=(title, title), bg='light blue').pack()
window.mainloop()
print(percent)
print(fail)
以下行:
for percent, fail, title in currenttime:
暗示currenttime
是一个元组列表,当它是你的例子中的一个列表,并转换为:
for (percent, fail, title) in currenttime:
如果你想得到currenttime
的3个元素你应该做什么:
percent = currenttime[0]
fail = currenttime[1]
title = currenttime[2]
或使currenttime
成为元组:
currenttime = (perc[counter], fails[counter], titles[counter])
percent, fail, title = currenttime
for
命令的源必须是可迭代的。你的是一个iterable,它在每次迭代时返回一个字符串。第一个元素返回"67"
,它只有两个要解包的元素。
对于你想要的功能,currentime
的每个元素都必须是三元组。例如:
currenttime = [
['67', '1', 'subsection'],
['18', '5', 'main branch'],
...
]
在这种情况下,每次迭代都会产生三个值来解包。