ref python

ref python

1. Análise Léxica

   • converte sequencia de letras em sequencia de tokens, sobre o qual a analise sintatica trabalhara
   • Junção de linhas explicita "\"
   • Junção de linhas implícita
     • Expressions in parentheses, square brackets or curly braces can be split over more than one physical line without using backslashes.
   • palavras chaves
     • False True None if else elif try except finally def return class del import for while break continue in is as pass await   pass     raise      and or not  lambda   from nonlocal  assert global  with async  yield
   • soft keys
     • match, case e _
   • Lieterais
     • stringprefix ::= "r"  | "f" |"b" r-> no \ b-> byte f-> format 
     • name = "Fred" f"He said his name is {name!r}." f"He said his name is {repr(name)}." # repr() is equivalent to !r width = 10 precision = 4 value = decimal.Decimal("12.34567") f"result: {value:{width}.{precision}}" # nested fields today = datetime(year=2017, month=1, day=27) f"{today:%B %d, %Y}" # using date format specifier f"{today=:%B %d, %Y}" # using date format specifier and debugging number = 1024 f"{number:#0x}" # using integer format specifier foo = "bar" f"{ foo = }" # preserves whitespace line = "The mill's closed" f"{line = }" f"{line = :20}" f"{line = !r:20}"
   • Operadores e Delimitadores
     • + - * ** / // % @ << >> & | ^ ~ := < > <= >= == !=
     • ( ) [ ] { } , : . ; @ = -> += -= *= /= //= %= @= &= |= ^= >>= <<= **=

2. Modelos de dados

   • Modelo de dados

3. Modelo de execução

4. Sistema de importação

5. expressões

6. statements

7. Instruções compostas

8. Componentes de High-level