Python locals() function returns the dictionary of the current local symbol table.
- Symbol table: It is a data structure created by a compiler for which is used to store all information needed to execute a program.
- Local symbol Table: This symbol table stores all information needed for the local scope of the program and this information is accessed using python built-in function locals().
Syntax : locals()
Parameters: This function does not takes any input parameter.
Return Type : This returns the information stored in local symbol table.
Python locals() method example
Example 1: Python locals() works insides a local scope
Python3
# Python program to understand about locals# here no local variable is presentdef demo1(): print("Here no local variable is present : ", locals())# here local variables are presentdef demo2(): name = "Ankit" print("Here local variables are present : ", locals())# driver codedemo1()demo2() |
Output;
Here no local variable is present : {}
Here local variables are present : {'name': 'Ankit'}
Example 2: Updating using locals()
Unlike globals() this function can not modify the data of the local symbol table. The below program explains it clearly.
Python3
# Python program to understand about locals# here no local variable is presentdef demo1(): print("Here no local variable is present : ", locals())# here local variables are presentdef demo2(): name = "Ankit" print("Here local variables are present : ", locals()) print("Before updating name is : ", name) # trying to change name value locals()['name'] = "Sri Ram" print("after updating name is : ", name)# driver codedemo1()demo2() |
Output:
Here no local variable is present : {}
Here local variables are present : {'name': 'Ankit'}
Before updating name is : Ankit
after updating name is : Ankit
Example 3: locals() for global environment
The local symbol table is the same as the global symbol table in the case of the global environment.
Python3
# Python program to understand about locals# data using localsprint("This is using locals() : ", locals())# data using globalsprint("This is using globals() : ", globals()) |
Output:
This is using locals() : {‘__name__’: ‘__main__’, ‘__doc__’: ‘Automatically created module for IPython interactive environment’, ‘__package__’: None, ‘__loader__’: None, ‘__spec__’: None, ‘__builtin__’: <module ‘builtins’ (built-in)>, ‘__builtins__’: <module ‘builtins’ (built-in)>, ‘_ih’: [”, ‘import multiprocessing\nfrom bs4 import BeautifulSoup\nfrom queue import Queue, Empty\nfrom concurrent.futures import ThreadPoolExecutor\nfrom urllib.parse import urljoin, urlparse\nimport requests\n\n\nclass MultiThreadedCrawler:\n\n def __init__(self, seed_url):\n self.seed_url = seed_url\n self.root_url = \'{}://{}\’.format(urlparse(self.seed_url).scheme,\n urlparse(self.seed_url).netloc)\n self.pool = ThreadPoolExecutor(max_workers=5)\n self.scraped_pages = set([])\n self.crawl_queue = Queue()\n self.crawl_queu
Python locals VS global functions
The python globals() function in Python returns the dictionary of the current global symbol table.
Syntax: globals() Parameters: No parameters required.
Python3
# Python3 program to demonstrate global() function# global variablea = 5def func(): c = 10 d = c + a # Calling globals() globals()['a'] = d print (d) # Driver Code func() |
Output:
15
Python locals() function in Python returns the dictionary of the current local symbol table.
Python3
locals() |
Output:
{‘__name__’: ‘__main__’,
‘__doc__’: ‘Automatically created module for IPython interactive environment’,
‘__package__’: None,
‘__loader__’: None,
‘__spec__’: None,
‘__builtin__’: <module ‘builtins’ (built-in)>,
‘__builtins__’: <module ‘builtins’ (built-in)>,
‘_ih’: [”,
‘# Python program to demonstrate the use of\n# len() method \n\n# Length of below string is 5\nstring = “Lazyroar” \nprint(len(string))\n\n# Length of below string is 15\nstring = “Lazyroar for Lazyroar” \nprint(len(string))’,
‘# Python program to demonstrate the use of\n# len() method \n\n# L
