Read the file python basis of

# Read the file name txt file 

reading open # files ( "file", "literacy method") with open ( "file", "literacy method") as a handle to: 
# create a file or write to file in 
# = Open File ( "userinfo.txt", "w", encoding = "UTF-8") 
# file.write ( "life is short, \ n nothing much money, \ n carpe diem.") 
# how to determine whether the file is closed it? file.closed returns True if closed, the anti-False 
# Print ( "Check that file is normally closed:", file.closed) 
# close the file 
# File.close () 
# Print ( "Check that file is normally closed : ", file.closed) 

# r + represents a readable and writable file exists on the cover 
# = Open file (" userinfo.txt "," r + ", encoding =" UTF-8 ") 
# file.write (" China you good ") 
to close the file # 
# File.close () 


# read the file contents 
#read (bytes) read all content or a byte 
# file = open (" userinfo.txt " ," r ", encoding = "



Print # (FILE.readline ()) 
#radelines read all of the content, and all contents stored in a list, line breaks \ n 
# Print (file.readlines ()) 

# remove \ n 
converted into a string list # "" .join (list) -> str.strip ( ) to filter out special characters 
# n1 = file.readlines () # list 
# n2 = "" .join (N1) # 
# # Print (n2.strip ()) 
# # Print (of the type (n2.strip ())) 

# append files & a + a 
# = Open file ( "userinfo.txt", "a", encoding = "UTF-8") 
# file.write ( "the Hello, World ") 
Close file # 
# File.close () 


# R & lt read a file, the file does not exist on the error read, r + can read and write files, overwrite the original file content 
# file = open (" testinfo " ," r ", = encoding "UTF-. 8") 
# Print (file.readlines ()) 
#FileNotFoundError: [Errno 2] No SUCH File or Directory: 'testinfo'

# W write the contents of the file, remove the original file contents; w + content to read and write files, clear the contents of the original file
Open File = # ( "userinfo.txt", "w +", encoding = "UTF-8") 
# file.write ( "Life is short, \ n nothing much money, \ n carpe diem .hello") 
# closing the file 
# File.close () 


# managed with open as the context 

# with Open ( "userinfo.txt", "W", encoding = "UTF-. 8") AS F: 
# f.write ( "contexts write the contents ") 

# with Open (" userinfo.txt "," R & lt ", encoding =" UTF-. 8 ") AS F: 
    # Print (f.readlines ()) 
# Print (" check whether the file is normally closed : ", f.closed) 


# write class test scores, recorded in score.txt 
" "" 
Xiao Ming, 55 
flowers, 56 
Xiaohua, 77 
Wang, 84 
Xiao Liu, 65 
small study, 
"" " 
Import Re 
# calculate score.txt file for all test scores average 
# write the contents to score.txt 文件中
# with open("score.txt","w",encoding="utf-8") as file:
# A file.write ( "Bob, 55 \ n florets, 56 \ n Xiaohua, 77 \ n Wang, 84 \ n Liu, 65 \ n small learning") 
# read content, calculates an average value 
with open ( "score.txt", "r", encoding = "UTF-8") AS File: 
    List = file.readlines () 
str1 = "" .join (List) 
str2 = str1.strip () 
# Print (str2, of the type (str2)) 
List1 = re.findall ( ", (. +)", str2) # use regular expressions to extract numbers, returns a list of 
# Print (List1, of the type (List1)) 
NUM = 0 
for index in the Range ( len (the List1)): 
    # Print (index) 
    NUM + = int (the List1 [index]) 
Print (NUM / len (the List1))