Python 中 function(#) (X)格式 和 (#)在Python3.*中的注意事项
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 func
func(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【听图阁-专注于Python设计】网站的支持！
