Python 如何更改 matplotlib 中的 x 轴，以便没有空格？
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How can I change the x axis in matplotlib so there is no white space?
提问by lmurdock12
So currently learning how to import data and work with it in matplotlib and I am having trouble even tho I have the exact code from the book.
所以目前正在学习如何导入数据并在 matplotlib 中使用它，即使我有书中的确切代码，我也遇到了麻烦。
This is what the plot looks like, but my question is how can I get it where there is no white space between the start and the end of the x-axis.
这就是情节的样子，但我的问题是如何在 x 轴的起点和终点之间没有空白的地方得到它。
Here is the code:
这是代码：
import csv
from matplotlib import pyplot as plt
from datetime import datetime
# Get dates and high temperatures from file.
filename = 'sitka_weather_07-2014.csv'
with open(filename) as f:
reader = csv.reader(f)
header_row = next(reader)
#for index, column_header in enumerate(header_row):
#print(index, column_header)
dates, highs = [], []
for row in reader:
current_date = datetime.strptime(row[0], "%Y-%m-%d")
dates.append(current_date)
high = int(row[1])
highs.append(high)
# Plot data.
fig = plt.figure(dpi=128, figsize=(10,6))
plt.plot(dates, highs, c='red')
# Format plot.
plt.title("Daily high temperatures, July 2014", fontsize=24)
plt.xlabel('', fontsize=16)
fig.autofmt_xdate()
plt.ylabel("Temperature (F)", fontsize=16)
plt.tick_params(axis='both', which='major', labelsize=16)
plt.show()
回答by ImportanceOfBeingErnest
In matplotlib 2.x there is an automatic margin set at the edges, which ensures the data to be nicely fitting within the axis spines. In this case such a margin is probably desired on the y axis. By default it is set to 0.05in units of axis span.
To set the margin to 0on the x axis, use
在 matplotlib 2.x 中，边缘设置了一个自动边距，以确保数据很好地适合轴脊。在这种情况下，y 轴上可能需要这样的边距。默认情况下，它设置为0.05以轴跨度为单位。要将边距设置为0在 x 轴上，请使用
plt.margins(x=0)
or
或者
ax.margins(x=0)
depending on the context. Also see the documentation.
视上下文而定。另请参阅文档。
In case you want to get rid of the margin in the whole script, you can use
如果你想去掉整个脚本中的边距，你可以使用
plt.rcParams['axes.xmargin'] = 0
at the beginning of your script (same for yof course). If you want to get rid of the margin entirely and forever, you might want to change the according line in the matplotlib rc file:
在脚本的开头（y当然也一样）。如果您想完全永久地摆脱边距，您可能需要更改matplotlib rc 文件中的相应行：
axes.xmargin : 0
axes.ymargin : 0
或者更改边距，使用
plt.xlim(..)plt.xlim(..)或ax.set_xlim(..)ax.set_xlim(..)手动设置轴的限制，以便没有空白。