如何将 Python 中的字符串转换为数字?


要将字符串转换为数字,有多种方法。让我们逐一了解它们。

使用 int() 将字符串转换为数字

示例

在此示例中,我们将使用 int() 方法将字符串转换为数字 −

# String to be converted myStr = "200" # Display the string and it's type print("String = ",myStr) print("Type= ", type(myStr)) # Convert the string to integer using int() and display the type myInt = int(myStr) print("\nInteger = ", myInt) print("Type = ", type(myInt))

输出

String =  200
Type=  <class 'str'>

Integer =  200
Type =  <class 'int'>

使用 float() 将字符串转换为数字

示例

在此示例中,我们将使用 float() 方法将字符串转换为浮点数,然后使用 int() 方法将浮点数转换为整数 −

# String to be converted myStr = "500" # Display the string and it's type print("String = ",myStr) print("Type= ", type(myStr)) # Convert the string to float myFloat = float(myStr) print("\nFloat = ", myFloat) print("Type = ", type(myFloat)) # Convert the float to int myInt = int(myFloat) print("\nInteger = ", myInt) print("Type = ", type(myInt))

输出

String =  500
Type=  <class 'str'>

Float =  500.0
Type =  <class 'float'>

Integer =  500
Type =  <class 'int'>

使用 base10 和 base8 将字符串转换为数字

示例

在此示例中,我们将使用带 base 参数的 int() 将字符串转换为数字。

# String to be converted myStr = "500" # Display the string and it's type print("String = ",myStr) print("Type= ", type(myStr)) # Convert the string to int myInt1 = int(myStr) print("\nInteger (base10) = ", myInt1) print("Type = ", type(myInt1)) # Convert the string to int myInt2 = int(myStr, base=8) print("\nInteger (base8) = ", myInt2) print("Type = ", type(myInt2))

输出

String =  500
Type=  <class 'str'>
Integer (base10) =  500
Type =  <class 'int'>

Integer (base8) =  320
Type =  <class 'int'>

更新于: 16-Sep-2022

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