Python 精巧知识点备忘

字符串的操作

• 取出字符串中的其中一个字符

  string = "Python"
  
  #取出第一个字符
  
  first = string[0]
  
  #或者
  
  first = "Python"[0]

• 转换为字符串

#str()
pi = 3.14
print str(pi)

• 字符串串联：+

print "Spam "+"and "+"eggs"

#打印一个字符串和变量
string_1 = "Camelot"
string_2 = "place"
print "Let's not go to %s. It\' a silly %s."%(string_1,string_2)

#字符串直接带入
print "The %s who %s %s!" % ("Knights", "say", "Ni")

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datetime 库

from datetime import datetime

#备注：打印的不是北京时间
print datetime.now()

#打印部分时间，年或者月或者时间点

from datetime import datetime
now = datetime.now()
print now.year
print now.month
print now.day
print '%s:%s:%s' % (now.year, now.month, now.day)
print '%s/%s/%s' % (now.month, now.day, now.year)
print '%s:%s:%s' % (now.hour, now.minute, now.second)


#打印时间格式如下：mm/dd/yyyy hh:mm:ss
print '%s/%s/%s %s:%s:%s' % (now.month, now.day, now.year,now.hour, now.minute, now.second)