python 字符串 變量

Python | 檢查變量是否為字符串 (Python | Check if a variable is a string)

To check whether a defined variable is a string type or not, we can use two functions which are Python library functions,

要檢查定義的變量是否為字符串類型，我們可以使用兩個函數，它們是Python庫函數，

Using isinstance()

使用isinstance()

Using type()

使用type()

1)使用isinstance()函數檢查變量是否為字符串 (1) Checking a variable is a string or not using isinstance() function)

isinstance() function accepts two parameters – 1) variable name (object) and 2) data type (class) and returns whether an object is an instance of a class or of a subclass thereof.

isinstance()函數接受兩個參數– 1)變量名( 對象 )和2)數據類型( 類 )，并返回對象是類的實例還是其子類的實例。

Syntax:

句法：

isinstance(obj, class_or_tuple)

Example:

例：

# variables a = 100 # an integer variable b = 10.23 # a float variable c = 'A' # a character variable d = 'Hello' # a string variable e = "Hello" # a string variable # checking types if isinstance(a, str):print("Variable \'a\' is a type of string.") else:print("Variable \'a\' is not a type of string.")if isinstance(b, str):print("Variable \'b\' is a type of string.") else:print("Variable \'b\' is not a type of string.")if isinstance(c, str):print("Variable \'c\' is a type of string.") else:print("Variable \'c\' is not a type of string.")if isinstance(d, str):print("Variable \'d\' is a type of string.") else:print("Variable \'d\' is not a type of string.")if isinstance(e, str):print("Variable \'e\' is a type of string.") else:print("Variable \'e\' is not a type of string.")

Output

輸出量

Variable 'a' is not a type of string. Variable 'b' is not a type of string. Variable 'c' is a type of string. Variable 'd' is a type of string. Variable 'e' is a type of string.

2)使用type()函數檢查變量是否為字符串 (2) Checking a variable is string using type() function)

type() function accepts one parameter (others are optional), and returns its type.

type()函數接受一個參數(其他參數是可選的)，并返回其類型。

Syntax:

句法：

type(object)

Example:

例：

# variables a = 100 # an integer variable b = 10.23 # a float variable c = 'A' # a character variable d = 'Hello' # a string variable e = "Hello" # a string variable # checking types if type(a) == str:print("Variable \'a\' is a type of string.") else:print("Variable \'a\' is not a type of string.")if type(b) == str:print("Variable \'b\' is a type of string.") else:print("Variable \'b\' is not a type of string.")if type(c) == str:print("Variable \'c\' is a type of string.") else:print("Variable \'c\' is not a type of string.")if type(d) == str:print("Variable \'d\' is a type of string.") else:print("Variable \'d\' is not a type of string.")if type(e) == str:print("Variable \'e\' is a type of string.") else:print("Variable \'e\' is not a type of string.")

Output

輸出量

Variable 'a' is not a type of string. Variable 'b' is not a type of string. Variable 'c' is a type of string. Variable 'd' is a type of string. Variable 'e' is a type of string.

翻譯自: https://www.includehelp.com/python/check-whether-a-variable-is-a-string-or-not.aspx

python 字符串 變量

總結

以上是生活随笔為你收集整理的python 字符串 变量_检查变量是否为字符串的Python程序的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。