1. 문자열 연산하기
>>> head = "Python"
>>> tail = " is fun!"
>>> head + tail
'Python is fun!'
>>> a = "python"
>>> a * 2
'pythonpython'
print("=" * 50)
print("My Program")
print("=" * 50)
==================================================
My Program
==================================================
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2. 문자열 인덱싱과 슬라이싱
>>> a = "Life is too short, You need Python"
>>> a[3]
'e'
>>> a[0:4]
'Life'
문자열 요소값은 바꿀 수 없다. ( a[1]='y' 불가)
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3. 문자열 포매팅
>>> "I eat %d apples." % 3
'I eat 3 apples.'
number=10
day="three"
>>> "I ate %d apples. so I was sick for %s days." % (number, day)
'I ate 10 apples. so I was sick for three days.'
>>> "I eat {0} apples".format(3)
'I eat 3 apples'
>>> "I eat {0} apples".format("five")
'I eat five apples'
>>> "I ate {0} apples. so I was sick for {1} days.".format(number, day)
'I ate 10 apples. so I was sick for three days.'
>>> name = '홍길동'
>>> age = 30
>>> f'나의 이름은 {name}입니다. 나이는 {age}입니다.'
'나의 이름은 홍길동입니다. 나이는 30입니다.'
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4. 문자열 관련 함수들
문자 개수 세기(count)
>>> a = "hobby"
>>> a.count('b')
2
위치 알려주기1(find)
>>> a = "Python is the best choice"
>>> a.find('b')
14
>>> a.find('k')
-1
문자열 삽입(join)
>>> ",".join('abcd')
'a,b,c,d'
소문자를 대문자로 바꾸기(upper)
>>> a = "hi"
>>> a.upper()
'HI'
대문자를 소문자로 바꾸기(lower)
>>> a = "HI"
>>> a.lower()
'hi'
왼쪽 공백 지우기(lstrip)
>>> a = " hi "
>>> a.lstrip()
'hi '
오른쪽 공백 지우기(rstrip)
>>> a= " hi "
>>> a.rstrip()
' hi'
양쪽 공백 지우기(strip)
>>> a = " hi "
>>> a.strip()
'hi'
문자열 바꾸기(replace)
>>> a = "Life is too short"
>>> a.replace("Life", "Your leg")
'Your leg is too short'
문자열 나누기(split)
>>> a = "Life is too short"
>>> a.split()
['Life', 'is', 'too', 'short']
>>> b = "a:b:c:d"
>>> b.split(':')
['a', 'b', 'c', 'd']
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