jython学习笔记2

1.%是求余，//是整除的商，**是乘方

abs(var)	Absolute value
pow(x, y)	Can be used in place of ** operator
pow(x,y,modulo)	Ternary power-modulo (x **y) % modulo
round(var[, n])	Returns a value rounded to the nearest 10-n or (10**-n), where n defaults to 0)
divmod(x, y)	Returns a tuple of the quotient and the remainder of division

Operator Precedence from Highest to Lowest	Name
+var, -var, ~var	Unary Operations
**	Power Operations
*, /, //, %	Multiplication, Division, Floor Division, Modulo
+, -	Addition, Subtraction
<<, >>	Left and Right Shift
&	Bitwise And
^	Bitwise Exclusive Or
||	Bitwise Or
<, >, <=. >= , <>	Comparison Operators
==, != , is, is not, in, not in	Equality and Membership
and, or, not	Boolean Conditionals

Function	Description
chr(value)	Converts integer to a character
complex(real [,imag])	Produces a complex number
dict(sequence)	Produces a dictionary from a given sequence of (key, value) tuples
eval(string)	Evaluates a string to return an object…useful for mathematical computations. Note: This function should be used with extreme caution as it can pose a security hazard if not used properly.
float(value)	Converts number to float
frozenset(set) |Converts a set into a frozen set
hex(value)		Converts an integer into a string representing that number in hex
int(value [, base])		Converts to an integer using a base if a string is given
list(sequence)		Converts a given sequence into a list
long(value [, base])		Converts to a long using a base if a string is given
oct(value)		Converts  an integer to a string representing that number as an octal
ord(value)		Converts a character into its integer value
repr(value)		Converts object into an expression string. Same as enclosing expression in reverse quotes ( x + y).  Returns a string containing a printable and evaluable representation of the object
set(sequence)		Converts a sequence into a set
str(value)		Converts an object into a string  Returns a string containing a printable representation of the value, but not an evaluable string
tuple(sequence)		Converts a given sequence to a tuple
unichr(value)		Converts integer to a Unicode character

2. 对于可以修改的变量的缺省值，例如List, 在初始化的时候是不确定的，你希望它能够初始化成一个空的列表，但其实不是这样的。这点要注意

3.后进先出的栈。任何的Python方法都有返回值。

4.不知道如何在控制台接收键盘输入