파이썬(Python)

• 루비랑 비슷하긴 하지만 일부가 몹시다르다. CS를 공부해야하니 기초만 다뤄보자.
• 버전 : 2.7.0

문자열(String)

minwoo = "My name is minwoo"

print(miwnoo) #My name is minwoo
print(minwoo.find("My")) #0
print(minwoo.find(" ")) #2
print(miwnoo.replace("minwoo", "python")) #My name is python
print(miwnoo.upper) #MY NAME IS PYTHON
print(miwnoo.lower) #my name is python

• find(arg) : string 내에서 arguments의 위치(index)를 표시해준다.
• replace(arg1, arg2) : arg1부분을 arg2로 대체한다.
• uppper, lower : string을 대문자, 소문자로 바꾼다.

숫자(Number)

a = 10
b = 3

print(a + b) #13
print(a - b) #7
print(b - a) #-7
print(a * b) #30
print(a / b) #3
print(a % b) #1
print(a ** b) #1000

print(pow(a,b)) #1000
print(max(4,5,6,a,b)) #10
print(min(4,5,6,a,b)) #3

• pow(arg1,arg2) : arg1**arg2
• max(arg1,arg2..argN) : arg값들중 최대값
• min(arg1,arg2..argN) : arg값들중 최소값

import math

print(math.ceil(10.5)) #11
print(math.floor(10.5)) #10.0
print(math.sqrt(4)) #2.0
print(math.sin(1)) #0.841470984808

• math.ceil(arg) : arg소수점 올림.
• math.floor(arg) : arg소수점 내림
• math.sqrt(arg) : arg의 제곱근
• math.sin(arg) : arg의 sin값..수알못

배열(List)

food = ["Pancake", "Ramen", "Pho"]

print(food[0]) #Pancake
print(food[3]) #Error
print(food[-1]) #Pho

food[1] = "Noodle"

print(food) #['Pancake', 'Noodle', 'Pho']

아래와 같이 정의할수도 있다.

meat = list(["Pancake", "Ramen", "Pho"]) #['Pancake', 'Ramen', 'Pho']

print("Pancake" in meat) #true
print("Noodle" not in meat) #true
print(len(meat)) #3
print(max(meat)) #Ramen
print(min(meat)) #Pancake

meat.sort() #['Pancake', 'Pho', 'Ramen']
meat.reverse() #['Ramen', 'Pho', 'Pancake']
meat.append("Noodle") #['Ramen', 'Pho', 'Pancake', 'Noodle']

new_food = ["Egg", "Milk"]
meat.extend(new_food) #['Ramen', 'Pho', 'Pancake', 'Noodle', 'Egg', 'Milk']

meat.remove(new_food[0]) #['Ramen', 'Pho', 'Pancake', 'Noodle', 'Milk']

딕셔너리(Dictionary)

contact = {
    'email': '[email protected]',
    'phone': '010-0000-0000',
    'address': 'seoul'
}

print(contact['email']) #[email protected]

contact['edu'] = 'konkuk university' #edu넣음
del contact['email'] #email빠짐

print('email' in contact.keys()) #false
print('edu' in contact.keys()) #true

2중구조

contacts = {
  'minwoo1': {
    'email': '[email protected]',
    'phone': '010-0000-1111',
    'address': 'seoul1'
  },
  'minwoo2': {
    'email': '[email protected]',
    'phone': '010-0000-2',
    'address': 'seoul2'
  }
}

print(contacts['minwoo1']['email'])

제어흐름(Control flow)

if/else

i = 10

if i % 2 == 0:
  if i > 10:
    print("Number is even and greater than 10")
  elif i < 10:
    print("Number is even and less than 10")
  else:
    print("Number is evern and being 10")
else:
  print("Number is odd")

for/in

names = ["Minwoo", "Jane", "Gatsby"]

print(names[0])
print(names[1])
print(names[2])

for n in names:
  print(n)

index = 0

while index < len(names):
  print(names[index])
  index += 1

함수(Function)

def say_hi(name,age):
  print("My name is " + name + ".")
  print("I'm " + str(age) + " years old.")

say_hi("minwoo", 32)

스코프(이거 안되는 이유점)

number = 1
inside_number = 1

def summary():
  global number
  number = 10
  inside_number = 10
  print("number in summary " + str(number))
  print("inside_Number in summary " + str(inside_number))

summary()
print("number in Outside" + str(number))
print("inside_Number in Outside" + str(inside_number))

클래스(Class)

class Restaurant:
  def __init__(self, name, address, revenue):
    self.name = name
    self.address = address
    self.revenue = revenue
  def show_address(self):
    print(self.address)
  def show_revenue(self):
    print(self.revenue)
  def order(self, money):
    self.revenue += money

r1 = Restaurant("Pho", "itawon", 10)
r1.show_address() #itawon
r1.show_revenue() #10

r1.order(190)
r1.show_revenue() #200

모듈(Module)

import math #이것이 모듈

n = math.sqrt(16)
print(n) #4

직접 모듈을 만들어 호출할수 있다.

#my_module.py
number_of_styles=2

def style_upper(text):
    return text.upper()

def style_lower(text):
    return text.loweR()

#app.py
import my_module

print(my_module.number_of_styles)
print(my_module.style_upper("minwoo"))