Question

可以在一行不设名单的情况下书写。

for x in vec: 
    if x > 3:
         ...
         ...

Answer 1

www.un.org/Depts/DGACM/index_spanish.htm 页: 1

Compound statements consist of one or more ‘clauses.’ A clause consists of a header and a ‘suite.’ The clause headers of a particular compound statement are all at the same indentation level. Each clause header begins with a uniquely identifying keyword and ends with a colon. A suite is a group of statements controlled by a clause. A suite can be one or more semicolon-separated simple statements on the same line as the header, following the header’s colon, or it can be one or more indented statements on subsequent lines. Only the latter form of suite can contain nested compound statements; the following is illegal, mostly because it wouldn’t be clear to which if clause a following else clause would belong:

if test1: if test2: print x

Indeed, Python generates a SyntaxError for the nested ifs above. More formally regarding for, this is its grammar in Python:

for_stmt ::=  "for" target_list "in" expression_list ":" suite
              ["else" ":" suite]

suite         ::=  stmt_list NEWLINE | NEWLINE INDENT statement+ DEDENT

stmt_list     ::=  simple_stmt (";" simple_stmt)* [";"]

请注意,在<><>t>for>之后,在未作改动的情况下,该声明必须是stmt_list,其中仅允许simple_stmts. www.un.org/Depts/DGACM/index_spanish.htm

simple_stmt ::=  expression_stmt
                 | assert_stmt
                 | assignment_stmt
                 | augmented_assignment_stmt
                 | pass_stmt
                 | del_stmt
                 | print_stmt
                 | return_stmt
                 | yield_stmt
                 | raise_stmt
                 | break_stmt
                 | continue_stmt
                 | import_stmt
                 | global_stmt
                 | exec_stmt

哪一则包含诸如<代码>if和>的复合说明。





尽管如此,我们仍铭记,斯堪的辛奈旨在澄清问题。 因此,最好不要打上这种说法,这就是说什么是发电机/清单。 如果你认为你的计算足够简单,只需一行,那么你就会知道。 否则,你真的不希望通过把一切放在一线上来删除该法典,这完全是同tation。 几天后,几条外线没有花费很多费用。

Answer 2

See @KennyTM... noêt to compress that Much.

说到什么,for x in (i in vec if i > 3) do the work, as well as itertools.ifilter (or only the setin filter in /ecosoc 3) with a lambda x: x > 3migration. 它们也与所有电离层合作,并且是zy(例如,如果你<条码>,)。在休息期间,你只检查一个物品太多。

Answer 3

它可以,但列出谅解/声明的表述是此处应当使用的确切类型。根据您在<代码>if栏目中想要做些什么,您可以使用某种<代码>><>>>>>>> 或reduce/code>,但列出理解和生成器的表述可能是这样做的最佳方式。

Answer 4

否

用于过滤(lambda i:i>3,vec):

Answer 5

你们可以想象这样的东西:

def do_something(value):
    ...

def do_otherthing(value):
    ...


for x in t: do_something(x) if x>3 else do_otherthing(x)

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