如何格式化轴x日期（＆＃39; dd / mm / yyyy＆＃39;）？

Question

我曾搜索过如何更改轴x的格式来自＆＃39; Y-m-d＆＃39;到＆＃39; d / m / Y＆＃39;使用pandas和matplotlib，但我无法找到适合我的任何内容。

所以，这是我的代码：

import matplotlib.dates as mdates
df_w = df['week'] == dt.datetime.strptime('2016-03-13','%Y-%m-%d')
ax = df[df_w].plot(kind='bar',x='week');
_fmt = mdates.DateFormatter('%d/%m/%Y')
ax.xaxis.set_major_formatter(_fmt) 

我收到了这个错误：

ValueError: DateFormatter found a value of x=0, which is an illegal
date.  This usually occurs because you have not informed the axis that
it is plotting dates, e.g., with ax.xaxis_date()

Answer 1

我使用xticklabels

在ImportanceOfBeingErnest的帮助下解决了这个问题

df_w = df['week'] == dt.datetime.strptime('2016-03-13','%Y-%m-%d')
ax = df[df_w].plot(kind='bar',x='week');
ax.set_xlabel("Week");
new_label = []
for i in ax.get_xticklabels():
    date = dt.datetime.strptime(i.get_text(), '%Y-%m-%d %H:%M:%S')
    new_label.append(date.strftime("%d/%m/%Y"))

ax.set_xticklabels(new_label);