Python数据类型（完整列表）

Python 数据类型用于定义变量的类型。在本文中，我们将列出所有的数据类型，并讨论每种类型的功能。如果您刚开始学习 Python，请不要忘记先阅读初学者的 Python 教程。如果您已经阅读过相同的教程，请不要忘记查看我们之前关于 Python 注释和语句的教程。

Python数据类型

在Python中有不同类型的数据类型。一些内置的Python数据类型是：

• Numeric data types: int, float, complex
• String data types: str
• Sequence types: list, tuple, range
• Binary types: bytes, bytearray, memoryview
• Mapping data type: dict
• Boolean type: bool
• Set data types: set, frozenset
  1. Python Numeric Data Type
  Python numeric data type is used to hold numeric values like;

  int – holds signed integers of non-limited length.
  long- holds long integers(exists in Python 2.x, deprecated in Python 3.x).
  float- holds floating precision numbers and it’s accurate up to 15 decimal places.
  complex- holds complex numbers.

  In Python, we need not declare a datatype while declaring a variable like C or C++. We can simply just assign values in a variable. But if we want to see what type of numerical value is it holding right now, we can use type(), like this:
  #create a variable with integer value.
  a=100
  print(“The type of variable having value”, a, ” is “, type(a))

  #create a variable with float value.
  b=10.2345
  print(“The type of variable having value”, b, ” is “, type(b))

  #create a variable with complex value.
  c=100+3j
  print(“The type of variable having value”, c, ” is “, type(c))

  If you run the above code you will see output like the below image.
  2. Python String Data Type
  The string is a sequence of characters. Python supports Unicode characters. Generally, strings are represented by either single or double-quotes.
  a = “string in a double quote”
  b= ‘string in a single quote’
  print(a)
  print(b)

  # using ‘,’ to concatenate the two or several strings
  print(a,”concatenated with”,b)

  #using ‘+’ to concate the two or several strings
  print(a+” concated with “+b)

  The above code produces output like the below picture-
  3. Python List Data Type
  The list is a versatile data type exclusive in Python. In a sense, it is the same as the array in C/C++. But the interesting thing about the list in Python is it can simultaneously hold different types of data. Formally list is an ordered sequence of some data written using square brackets([]) and commas(,).
  #list of having only integers
  a= [1,2,3,4,5,6]
  print(a)

  #list of having only strings
  b=[“hello”,”john”,”reese”]
  print(b)

  #list of having both integers and strings
  c= [“hey”,”you”,1,2,3,”go”]
  print(c)

  #index are 0 based. this will print a single character
  print(c[1]) #this will print “you” in list c

  The above code will produce output like this-
  4. Python Tuple
  The tuple is another data type which is a sequence of data similar to a list. But it is immutable. That means data in a tuple is write-protected. Data in a tuple is written using parenthesis and commas.
  #tuple having only integer type of data.
  a=(1,2,3,4)
  print(a) #prints the whole tuple

  #tuple having multiple type of data.
  b=(“hello”, 1,2,3,”go”)
  print(b) #prints the whole tuple

  #index of tuples are also 0 based.

  print(b[4]) #this prints a single element in a tuple, in this case “go”

  The output of this above python data type tuple example code will be like the below image.
  5. Python Dictionary
  Python Dictionary is an unordered sequence of data of key-value pair form. It is similar to the hash table type. Dictionaries are written within curly braces in the form key:value. It is very useful to retrieve data in an optimized way among a large amount of data.
  #a sample dictionary variable

  a = {1:”first name”,2:”last name”, “age”:33}

  #print value having key=1
  print(a[1])
  #print value having key=2
  print(a[2])
  #print value having key=”age”
  print(a[“age”])

  If you run this python dictionary data type example code, the output will be like the below image.

关于Python数据类型，今天就说到这里。不要忘记在自己的机器上运行每一行代码。同时，不要只是复制粘贴。尝试自己编写代码。＃愉快编码 🙂 参考资料：Python数据类型文档