Day6- [再不學python我要被世界淘汰了] Modify Srings/String Concatenation

Modify Srings()

Upper Case

a = "Hello, World!"
print(a.upper())

output :

HELLO, WORLD!

Lower Case

a = "Hello, World!"
print(a.lower())

hello, world!

Remove Whitespace

removes any whitespace from the beginning or the end

移除字串開頭與結尾的所有空白字元（包含空格與跳行符號等）。

a = " Hello, World! "
print(a.strip()) # returns "Hello, World!"

Replace String

將字串中所有指定的子字串替換為新的內容。

a = "Hello, World!"
print(a.replace("H", "J"))

output :

Jello, World!

Split String

splits the string into substrings if it finds instances of the separator:

依指定分隔符號（如逗號）將字串切割為多個子字串，回傳串列（list）

a = "Hello, World!"
print(a.split(",")) # returns ['Hello', ' World!']

output :

['Hello', ' World!']

String Concatenation(字串串接)

To concatenate, or combine, two strings you can use the + operator.

要合併（串接）兩個字串，可以使用 + 運算子。

greeting = "Welcome,"
user = "Alice"
message = greeting + " " + user + "!"
print(message)  # 輸出：Welcome, Alice!

subject = "Math"
score = "90"
result = subject + ": " + score
print(result)  # 輸出：Math: 90