[Python] CHAP. 03

1.繰り返し練習(1)

-再帰関数recursion

def sum(n):
	if n==1:
    	return 1
    return n+sum(n-1)
    
a = sum(10)
print(a)

-加算を使用した乗算

a = 2
b = 3
s = 0
for i in range(b)
	s = s + a
print(a, "X", B, "=", S)

def multiply(a,b):
	s = 0
    for i in range(b)
    	s = s + a
    return s
    
a = 2
b = 3
c = multiply(a,b)
print(a, "X", b, "=", c)

-条件文

def multifly(a,b)
 	s = 0
 	a_abs = a
    b_abs = b
    
	negatives = 0;
	if a < 0:
    	negative += 1
        a_abs = -a
    if b < 0:
    	negative += 1
        b_abs = -b
        
    #positive : True, negative : False
    sign = negatives % 2 == 0
    
    for i in range(b_abs):
     	s = s + a_abs
        
    if (sign == False):
    	s = -s
        
    return s
    
a = input()
b = input()
s = multifly(a, b)
print(a, 'x', b, '=', s)

def multifly(a, b)
	s = 0
    if (b < 0):
    	for i in range(-b)
        	s = s - a
    else:
    	for i in range(b):
        	s = s + a
    return s
    
a = input()
b = input()
c = multifly(a, b)
print(a, "x", b, "=", c)

-使用法

a = 1
b = 2
print(a, b)
t = a
a = b
b = t
print(a, b)

a = 1
b = 2
print(a, b)
(a, b) = (b, a)
print(a, b)

-小数点以下の大数が保持されている関数を作成します。

import random
def getMaxMin(a, b):
	if a < b :
    	maxValue = b
        minValue = a
    else:
        maxValue = a
        minValue = b
    return (maxValue, minValue)
    # 두 값을 하나로 묶어서 남긴다
    
a = random.randint(0, 100)
b = random.randint(0, 100)
max, min = getMaxMin(a, b)
print("max:", max, "min:", min)

- while

i = 0
while(i < 3):
	print(i)
    i = i + 1
print("end of 'while' ")

2.繰り返し練習(2)

-アスタリスク出力

j = 0
for k in range(3)
	j = j + 1
    for i in range(j):
    	print("*", end="")
    print()

- range

for i in range(2, 11, 2):
	print(i, end=" ")

[결과]
2 4 6 8 10

-カウントダウン

import time
for i in range(10, 0, -1):
	print(i)
    time.sleep(1)	# 모듈이름 + . + 함수이름(1초동안 멈춘다)
    
print("펑")
print("%c"%(7))
print("{0:c}:.format(7)	# 소리 나는 방법

-文字列の処理

については、7、8、13、27、32、65を参照してください.

-文字コード関連関数

>>> 65
65
>>>chr(65)
'A'
>>>chr(66)
'B'
>>>chr(67)
'C'

for i in range(65, 65+26):
	c = chr(i)
    print(c, end='')

[결과]
ABCDEFGHIJKLMNOPQRSTUVWXYZ