python 学习笔记

• Python Syntax
  
  • 函数定义： “def function:”
  • 单行注释(comment)：在行首加'#'
  • 多行注释： """text……text"""
  • 乘幂：10 ** 2 （表示10的2次方）
• Tip Calculator
  • 15 / 100 的结果为0，就是说python中整数默认变量类型还是整数。
Strings & Console Output
• 和c++一样的转义字符：'\''
• 可以直接把固定字符串当做指针变量用：fifth_letter = "MONTY"[4]
• 取字符串长度：len("text")
• 返回所有字符变成小写的字符串：text.lower()
• 返回所有字符变成大写的字符串：text.upper()
• 返回转化后的字符串（d可为任意非字符串变量）：str(d)
• print "text" + str(3.14)   （不能直接print "text" + 3.14）
• print "%s, %s" % (str1, str2)
• quest = raw_input("What is your quest?")  与c++中 scanf("What is your quest?%s", &quest) 类似
• Date and Time
  • from datetime import datetime
  • now = datetime.now()
    • now.date()
    • now.year, now.month, now.day (字符串类型)
    • now.hour, now.minute, now.second
Conditionals & Control Flow

• if answer == "left" or answer == "l":
          print "This is the Verbal Abuse Room, you heap of parrot droppings!"
      elif answer == "right" or answer == "r":
          print "Of course this is the Argument Room, I've told you that already!"
      else:
          print "You didn't pick left or right!"

• not 即为 ! 

• not > and > or