Python 中 function(#) (X)格式 和 (#)在Python3.*中的注意事项

Python  /  管理员 发布于 7年前   198

python 的语法定义和C++、matlab、java 还是很有区别的。

1. 括号与函数调用

def devided_3(x):   return x/3.

print(a)    #不带括号调用的结果：<function a at 0x139c756a8>
print(a(3)) #带括号调用的结果：1

不带括号时，调用的是函数在内存在的首地址； 带括号时，调用的是函数在内存区的代码块，输入参数后执行函数体。

2. 括号与类调用

class test():  y = 'this is out of __init__()'  def __init__(self):    self.y = 'this is in the __init__()' x = test  # x是类位置的首地址print(x.y) # 输出类的内容：this is out of __init__()x = test() # 类的实例化print(x.y) # 输出类的属性：this is in the __init__() ;

3. function(#) (input)

def With_func_rtn(a):  print("this is func with another func as return")  print(a)  def func(b):    print("this is another function")    print(b)  return funcfunc(2018)(11)>>> this is func with another func as return  2018  this is another function  11

其实，这种情况最常用在卷积神经网络中：

def model(input_shape):  # Define the input placeholder as a tensor with shape input_shape.  X_input = Input(input_shape)  # Zero-Padding: pads the border of X_input with zeroes  X = ZeroPadding2D((3, 3))(X_input)  # CONV -> BN -> RELU Block applied to X  X = Conv2D(32, (7, 7), strides = (1, 1), name = 'conv0')(X)  X = BatchNormalization(axis = 3, name = 'bn0')(X)  X = Activation('relu')(X)  # MAXPOOL  X = MaxPooling2D((2, 2), name='max_pool')(X)  # FLATTEN X (means convert it to a vector) + FULLYCONNECTED  X = Flatten()(X)  X = Dense(1, activation='sigmoid', name='fc')(X)  # Create model. This creates your Keras model instance, you'll use this instance to train/test the model.  model = Model(inputs = X_input, outputs = X, name='HappyModel')  return model

总结

以上所述是小编给大家介绍的Python 中 function(#) (X)格式 和 (#)在Python3.*中的注意，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对站的支持！