
import itertools


def take_while(predicate, items):
    return list(itertools.takewhile(predicate, items))


def drop_while(predicate, items):
    return list(itertools.dropwhile(predicate, items))


def not_(func):
    return lambda *args, **kwargs: not func(*args, **kwargs)


def first(predicate, iterable):
    for item in iterable:
        if predicate(item):
            return item
    return None


def rfirst(predicate, iterable):
    return first(predicate, reversed(list(iterable)))


def catch(func, *args, **kwargs):
    """
    Executes `func` with `args` and `kwargs` as arguments. If `func` throws an error, this function
    returns the error, otherwise it returns `None`.
    """
    try:
        func(*args, **kwargs)
    except Exception as error:
        return error


import itertools


def take_while(predicate, items):
    return list(itertools.takewhile(predicate, items))


def drop_while(predicate, items):
    return list(itertools.dropwhile(predicate, items))


def not_(func):
    return lambda *args, **kwargs: not func(*args, **kwargs)


def first(predicate, iterable):
    for item in iterable:
        if predicate(item):
            return item
    return None


def rfirst(predicate, iterable):
    return first(predicate, reversed(list(iterable)))


def catch(func, *args, **kwargs):
    """
    Executes `func` with `args` and `kwargs` as arguments. If `func` throws an error, this function
    returns the error, otherwise it returns `None`.
    """
    try:
        func(*args, **kwargs)
    except Exception as error:
        return error
    return None

Return None explicitly instead of implicitly
Return None explicitly instead of implicitly

  
  import itertools
  
  
  def take_while(predicate, items):
      return list(itertools.takewhile(predicate, items))
  
  
  def drop_while(predicate, items):
      return list(itertools.dropwhile(predicate, items))
  
  
  def not_(func):
      return lambda *args, **kwargs: not func(*args, **kwargs)
  
  
  def first(predicate, iterable):
      for item in iterable:
          if predicate(item):
              return item
      return None
  
  
  def rfirst(predicate, iterable):
      return first(predicate, reversed(list(iterable)))
  
  
  def catch(func, *args, **kwargs):
      """
      Executes `func` with `args` and `kwargs` as arguments. If `func` throws an error, this function
      returns the error, otherwise it returns `None`.
      """
      try:
          func(*args, **kwargs)
      except Exception as error:
          return error
+     return None
  
Return None explicitly instead of implicitly
## Code Before:

import itertools


def take_while(predicate, items):
    return list(itertools.takewhile(predicate, items))


def drop_while(predicate, items):
    return list(itertools.dropwhile(predicate, items))


def not_(func):
    return lambda *args, **kwargs: not func(*args, **kwargs)


def first(predicate, iterable):
    for item in iterable:
        if predicate(item):
            return item
    return None


def rfirst(predicate, iterable):
    return first(predicate, reversed(list(iterable)))


def catch(func, *args, **kwargs):
    """
    Executes `func` with `args` and `kwargs` as arguments. If `func` throws an error, this function
    returns the error, otherwise it returns `None`.
    """
    try:
        func(*args, **kwargs)
    except Exception as error:
        return error

## Instruction:
Return None explicitly instead of implicitly
## Code After:

import itertools


def take_while(predicate, items):
    return list(itertools.takewhile(predicate, items))


def drop_while(predicate, items):
    return list(itertools.dropwhile(predicate, items))


def not_(func):
    return lambda *args, **kwargs: not func(*args, **kwargs)


def first(predicate, iterable):
    for item in iterable:
        if predicate(item):
            return item
    return None


def rfirst(predicate, iterable):
    return first(predicate, reversed(list(iterable)))


def catch(func, *args, **kwargs):
    """
    Executes `func` with `args` and `kwargs` as arguments. If `func` throws an error, this function
    returns the error, otherwise it returns `None`.
    """
    try:
        func(*args, **kwargs)
    except Exception as error:
        return error
    return None
