學習筆記(02):Python 面試100講（基於Python3.x）-各種類型的變量與值之間的多種連接方式...

立即學習:https://edu.csdn.net/course/play/26755/340111?utm_source=blogtoedu

不同的數據類型變量首尾相連

 

字符串與字符串之間

 

1. +

 

s1 = "hello"
s2 = "world"
s = s1 + s2
print(s)

 

2. 直接連接

 

s = "hello" "world"
print(s)

 

3. 輸出重定向

old_stdout = sys.stdout
result = StringIO()
sys.stdout = result
print("hello", "world")
sys.stdout = old_stdout
print(result.getvalue())

 

4. 格式化輸出

s1 = "hello"
s2 = "world"
s = "%s %s" % (s1,s2)
print(s)

5. join

 

s1 = "hello"
s2 = "world"
s = " ".join([s1, s2])
print(s)

 

字符串和非字符串拼接

1. +

n = 20
v = 12.44
b = True
print(s + str(n) + str(v) + str(b))

2. 格式化

n = 20
v = 12.44
b = True
s = "%s %d %f %s" % (s1, n, v, b)
print(s)

3. 重定向

n = 20
v = 12.44
b = True
old_stdout = sys.stdout
result = StringIO()
sys.stdout = result
print(n, v, b)
sys.stdout = old_stdout
print(result.getvalue())

字符串+class 輸出特定內容

實現class中的__str__方法

class MyClass:
    def __str__(self):
        return "myclass"

my = MyClass()
s = "test " + str(my)
print(s)