An in-depth analysis of Python's data type conversion functions and usage examples

Detailed explanation of Python data type conversion function and usage examples

In Python programming, data type conversion is a very common operation. When we deal with different types of data, we need to convert it into the appropriate type for manipulation or comparison. Python provides a series of data type conversion functions that can easily convert between data types. This article will introduce various data type conversion functions in Python in detail and provide usage examples.

1. int() function
   int() function is used to convert a number or string to an integer. If the conversion fails, a ValueError exception will be thrown.

Example 1: Convert a number to an integer type

num = 10.5
num_int = int(num)
print(num_int)  # 输出：10

Example 2: Convert a string to an integer type

str_num = "20"
str_num_int = int(str_num)
print(str_num_int)  # 输出：20

2. float() function
   float() function is used to convert a number or string to floating point type. If the conversion fails, a ValueError exception will be thrown.

Example 1: Convert a number to a floating point type

num_int = 10
num_float = float(num_int)
print(num_float)  # 输出：10.0

Example 2: Convert a string to a floating point type

str_num = "3.14"
str_num_float = float(str_num)
print(str_num_float)  # 输出：3.14

3. str() Function
   str() function is used to convert an object into a string.

Example 1: Convert integer to string

num_int = 10
num_str = str(num_int)
print(num_str)  # 输出："10"

Example 2: Convert floating point to string

num_float = 3.14
num_str = str(num_float)
print(num_str)  # 输出："3.14"

4. bool() Function
   bool() function is used to convert an object to a Boolean value. If the value of the object is 0, empty, None or False, it will be converted to False, otherwise it will be converted to True.

Example 1: Convert integer to Boolean value

num_int = 0
num_bool = bool(num_int)
print(num_bool)  # 输出：False

Example 2: Convert string to Boolean value

str_empty = ""
str_bool = bool(str_empty)
print(str_bool)  # 输出：False

str_nonempty = "nonempty"
str_bool = bool(str_nonempty)
print(str_bool)  # 输出：True

5. list() function
   The list() function is used to convert an iterable object into a list.

Example 1: Convert string to list

str_word = "hello"
str_list = list(str_word)
print(str_list)  # 输出：['h', 'e', 'l', 'l', 'o']

Example 2: Convert tuple to list

tuple_nums = (1, 2, 3)
tuple_list = list(tuple_nums)
print(tuple_list)  # 输出：[1, 2, 3]

6. tuple() function## The #tuple() function is used to convert an iterable object into a tuple.
   

list_nums = [1, 2, 3]
list_tuple = tuple(list_nums)
print(list_tuple)  # 输出：(1, 2, 3)

str_word = "hello"
str_tuple = tuple(str_word)
print(str_tuple)  # 输出：('h', 'e', 'l', 'l', 'o')

set() function# The ##set() function is used to create an unordered collection of non-repeating elements.
7. 
   
Example 1: Convert a list to a set

list_nums = [1, 2, 2, 3, 3, 3]
list_set = set(list_nums)
print(list_set)  # 输出：{1, 2, 3}

Example 2: Convert a string to a set

str_word = "hello"
str_set = set(str_word)
print(str_set)  # 输出：{'e', 'o', 'l', 'h'}

Through the introduction of this article, we have learned about Python Common data type conversion functions and usage examples are provided. In actual programming, by using these functions flexibly as needed, conversion between different data types can be easily achieved.

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