fruit_list = ['apple','banana','orange'] #列表转换为元组: tuple(fruit_list) #列表不能直接转换为字典,附: #列表转换为字符串: str(fruit_list) 字典转换为元组 可以使用函数 tuple() 和 list() 将字典转换为元组和列表,但要注意的是,这里的转换后和之前的元素顺序是不同的,因为字典类似于散列,列表...
这里我们创建了三个变量,vendor1,vendor2以及vendor3,分别将字符串Cisco, Juniper以及Arista赋值给了它们,因为这里字符串Arista混用了单引号和双引号,导致解释器报错,重新给vendor3赋值后解决了这个问题。这时我们可以用print这个语句(statements)将三个变量的内容打印出来。
函数enumerate()的参数为可遍历的变 量,如字符串,列表等均可,返回 enumerate 类。 # for循环遍历列表list1=['python','java','go','shell']forbinlist1:print(b)# python java go shell# for循环遍历列表,并打印索引和值forindex,elsinenumerate(list1):print(index,els)# 0 python 1 java 2 go 3 ...
for iterating_var in sequence: statements(s) statements(s) 2、Python while 循环嵌套语法 while expression: while expression: statement(s) statement(s) 3、你可以在循环体内嵌入其他的循环体如在while循环中可以嵌入for循环 反之你可以在for循环中嵌入while循环。 i = 2 while(i < 100): j = 2 while...
statements(s) # sequence type can be string, tuple or list for i in "abcd": print i for i in [1, 2, 3, 4]: print i # range(start, end, step), if not set step, default is 1, # if not set start, default is 0, should be noted that it is [start, end), no...
for循环可以遍历任何序列的项目,如一个列表(['Google','Runoob',1997,2000])或者一个字符串("abcdefg")。 for循环的一般格式如下: for<variable(变量)>in<sequence(序列)>:<statements(声明,结果)>else:<statements> 实例: >>>languages = ["C","C++","Perl","Python"]>>>forxinlanguages: ...
10.1 A list is a sequence Like a string, a list is a sequence of values. In a string, the values are characters; in a list, they can be any type. The values in a list are called elements or sometimes items. There are several ways to create a new list; the simplest is to enclos...
py.list({'This','is a','list'}) % Call built-in function list py.textwrap.wrap('This is a string') % Call wrap function in module textwrap You can execute Python statements in the Python interpreter directly from MATLAB using thepyrunorpyrunfilefunctions. For example: ...
The second target list is a[b] (you may expect this to throw an error because both a and b have not been defined in the statements before. But remember, we just assigned a to {} and b to 5). Now, we are setting the key 5 in the dictionary to the tuple ({}, 5) creating a...
def parse(sql, encoding=None):"""Parse sql and return a list of statements.:param sql: A string containing one or more SQL statements.:param encoding: The encoding of the statement (optional).:returns: A tuple of :class:`~sqlparse.sql.Statement` instances."""return tuple(parsestream(sql...