.replace(), .strip(), .upper(), .count(), len()

.replace()

say = "하이"
print(say.replace("하이", "올라"))

올라

.strip() 공백 제거

# .rstrip()
# .lstrip()

a = "   t e s t   "
print(a.strip())

t e s t

.upper() 대문자

# .lower()

a = "grace"
print(a.upper())

GRACE

.count() len()

msg = "Sunflower loves Sun."
print(msg.count("Sun"))
# 2

print(msg.count("a"))
# 0

print(len(msg))
# 20