为什么不能在同一行定义类和函数?

对于一行复合语句,正文必须是 a simple statement, or a semicolon-separated list of simple statements :

suite         ::=  stmt_list NEWLINE | NEWLINE INDENT statement+ DEDENT
statement     ::=  stmt_list NEWLINE | compound_stmt
stmt_list     ::=  simple_stmt (";" simple_stmt)* [";"]

它不能是复合语句。这将为太多混乱和模棱两可的语法打开大门。例如,

if True: if False: pass
else: print('Which "if" does this "else" go with?')