python

画图

import matplotlib.pyplot as plt
plt.figure(1)
# plt.subplot(211)
plt.plot(x, y[begin:end], 'r')
plt.xlabel('Hot words')
plt.ylabel('Visit times')
plt.show()

"{1} {0} {1}".format("hello", "world") # 设置指定位置
'world hello world'

命令行参数解析optparse

import logging
from optparse import OptionParser
# Display progress logs on stdout
logging.basicConfig(level=logging.INFO,
                    format='%(asctime)s %(levelname)s %(message)s')

# parse commandline arguments
op = OptionParser()
op.add_option("--lsa",
              dest="n_components", type="int",
              help="Preprocess documents with latent semantic analysis.")
op.add_option("--no-minibatch",
              action="store_false", dest="minibatch", default=True,
              help="Use ordinary k-means algorithm (in batch mode).")

日志和时间

随机数

from random import randint