定义函数时非默认参数遵循默认参数

Question

此代码来自 Here

def cumhist(df, bins=None, title, labels, range = None):
    '''Plot cumulative sum  + Histogram in one plot'''
    if bins==None:
       bins=int(df.YearDeci.max())-int(df.YearDeci.min())
    fig = plt.figure(figsize=(15, 8))
    ax = plt.axes()
    plt.ylabel("Proportion")
    values, base, _ = plt.hist( df  , bins = bins, normed=True, alpha = 0.5, color = "green", range = range, label = "Histogram")
    ax_bis = ax.twinx()
    values = np.append(values,0)
    ax_bis.plot( base, np.cumsum(values)/ np.cumsum(values)[-1], color='darkorange', marker='o', linestyle='-', markersize = 1, label = "Cumulative Histogram" )
    plt.xlabel(labels)
    plt.ylabel("Proportion")
    plt.title(title)
    ax_bis.legend();
    ax.legend();
    plt.show()
    return

我只添加了 If 部分。我收到 n 个错误提示

  File "<ipython-input-80-07c703baab76>", line 1
    def cumhist(df, bins=None, title, labels, range = None):
               ^
SyntaxError: non-default argument follows default argument

我该如何解决这个问题？

Answer 1

该错误消息表示您不能在函数参数列表中的非可选参数前加上 bins=None。通过删除默认 =None 使 bins 成为非可选的，或者将其移动到强制参数之后的位置。

定义函数时非默认参数遵循默认参数

Non-default argument follows default argument while defining a function

python

error-handling

histogram

cumulative-sum