# -*- coding: utf-8 -*-

print('123', 123)

print(type('123'), type(123)) # string, integer /ˈintidʒə/

print('123' + str(1), 123 + 1)

print('123' + str(1), 123 + int('1'))

def binary_add(x, y):

    carry = 0 # 进位。把溢出的携带到高位。

    i = len(x) - 1

    z = []

    while i >= 0:

        t = x[i] + y[i] + carry

        if t >= 2:

            carry = 1

            t -= 2

        else:

            carry = 0

        z.insert(0, t)

        i -= 1

    print(x, ' +\n', y, ' =\n', z, sep='')

binary_add( [0, 0, 1, 0], (0, 0, 1, 1) ) # A tuple is a read-only list

# n进制的数相加，某位最大n-1 + n-1 = 2n - 2，n-2留着，高位+1相当于低位+n，如9+9=1*10+8。更正: 忘了低位进来的1了。

# canonical(以最简数学方式)不是cannon(大炮)的形容词，后者两个n。

# 能搞明白纠错码的人不多，会补码就行。2 - 3 = 2 + (-3) = 010 + (~011 + 001) = 010 + 101 = 111

# -3 + 3 = 0 => -3 + 011 = 000 => ? 按位求反得到“互补”的两个数(像两把梳子错个齿)，它们的和是111, 再加1=0

# flip-flop: 人字拖鞋走起来啪嗒啪嗒：触发器 = trigger (扳机、触发、触发器)

print(len('\n'), '"' + '\n' + '"')

print(len('\\n'), '"' + '\\n' + '"')

# CR: carriage return, 字车返回(左边); LF: line feed，喂一行(纸往上卷一行); 都是机械打字机(typewriter)的术语。New line: 新行

# type+writer, type: printed letters, 印刷出的字母。typeface: 字体=font

# cast: 铸造, typecast: 重铸类型/类型转换，如int('123')

# 如果整不明白if A and (not B or C)，就整多条if，每条只整ABC中的一个，起码加print方便

# 写顺了a += b; a *= c, 别忘了a != 1不是a = !1

# eval(expression), exec(statement)

exec('gate_1_a = 0')

exec('gate_1_b = 1')

exec('gate_1_c = gate_1_a or gate_1_b')

exec('gate_2_a = gate_1_c')

exec('gate_2_b = not gate_2_a')

print(gate_2_b)

# exec(source, globals=None, locals=None, /)

# Execute the given source in the context of globals and locals.

# The source may be a string representing one or more Python statements or a code object as returned by compile().

# The globals must be a dictionary and locals can be any mapping, defaulting to the current globals and locals.

# If only globals is given, locals defaults to it.

str = '''

def wierd_func(a, b):

    if a > b:

        return b + 1

    else:

        return a + 1

'''

print(str)

exec(str)

exec('x = wierd_func(2, 3)')

print(x)

str = '''

# CSDN python getter setter

class Latch:

    def __init__(this): this.x = 0

    def set_(this, x): this.x = x

    def get_(self): return self.x

    def reset(): this.x = 0

'''

print(str)

exec(str)

exec('l1 = Latch()')

#exec('l1.set_(1)')

print(l1.get_())

quit()

with open(file_name, 'r', encoding='utf-8') as f:

    for line in f:

        words = line.split()

        kw = words[0].lower()

        for word in words:

            if len(word) > 13: print(word)

            dic[word.lower()] = kw