JackInTaiwan

# List
x = ["A", "B"]
x.insert(0, "C")  # ["C", "A", "B"]
x = [(1, 2), (2, 2), (2, 1)]
x.sort()  # [(1, 2), (2, 1), (2, 2)]

from copy import deepcopy
y = x.copy()  # shallow copy
y = deepcopy(x) # deep copy

JackInTaiwan

def print_func_name(func):
    def warp():
        print("Now use function '{}'".format(func.__name__))
        func()
    return warp


@print_func_name
def dog_bark():
    print("Bark !!!")

JackInTaiwan

class MyIterator:
    def __init__(self, max_num):
        self.max_num = max_num
        self.index = 0

    def __iter__(self):
        return self
        
    def __next__(self):
        self.index += 1

JackInTaiwan

import time



def print_func_name(time):
    def decorator(func):
        def wrap():
            print("Now use function '{}'".format(func.__name__))
            print("Now Unix time is {}.".format(int(time)))
            func()

JackInTaiwan

import dis

def dog_bark():
    for i in range(3):
        print('Miouwo ~~~')

if __name__ == '__main__':
    dis.dis(dog_bark)

JackInTaiwan

import tensorflow as tf


### Save the graph g1
g1 = tf.Graph()
with g1.as_default():
    a = tf.placeholder(tf.float32, name='a')
    b = tf.Variable(initial_value=tf.truncated_normal((1,)), name='b')
    c = tf.multiply(a, b, name='c')

JackInTaiwan

class MyIterator:
    def __init__(self, max_num):
        self.max_num = max_num

    def __iter__(self):
        num = 1
        while num <= self.max_num:
            yield num
            num += 1

JackInTaiwan

x = (i for i in range(2))

print(type(x))
# <class 'generator'>

print(next(x))
print(next(x))
print(next(x))

# 0

JackInTaiwan

def generator_func(value=0):
    while value < 10:
        value = yield value
        value += 1

generator = generator_func()

print('step 1')
print(next(generator))
print('step 2')

JackInTaiwan

class MyIterator:
    def __init__(self, max_num):
        self.max_num = max_num

    def __getitem__(self, key):
        if key <= self.max_num:
            return key
        else:
            raise IndexError