#coding:utf-8
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
import datetime
# x=np.arange(1,11,1)
# plt.plot(x,x)
# ax=plt.gca()
# '''
# locator_params
# 若不指定x,y轴  则同时修改x,y轴刻度
# 参数一为‘y’ 例如ax.locator_params('y',nbins=20) 意为指定y轴刻度为20
#
# '''
# ax.locator_params('y',nbins=20)
# plt.show()
fig=plt.figure()

start=datetime.datetime(2015,1,1)
stop=datetime.datetime(2016,1,1)
delta=datetime.timedelta(days=1)

dates=mpl.dates.drange(start,stop,delta)
y=np.random.rand(len(dates))
ax=plt.gca()
ax.plot_date(dates,y,linestyle='-',marker='')
#autofmt_xdate 坐标轴刻度自动伸缩
fig.autofmt_xdate()

plt.show()