Three forms the basis function defined functions movement of the cursor in the document

Open with # (r'a.txt ',' R & lt ', encoding =' UTF-. 8 ') AS F: 
# = DATAl reached, f.read () 
# Print ('>. 1>: ', DATAl) 
# Print (F .tell ()) # 44 is only one case, the character cursor mean 
# DATA2 reached, f.read = () 
# Print ( '> 2>:', DATA2) # result of the first time, the second is not, after the first reading the data at the cursor has been moved to the end of the file 

# only one case, the cursor is in units of characters: rt opened file, read () 
# with open (r'a.txt ',' rt ', = encoding 'UTF-. 8') aS F: 
# Print (reached, f.read (. 8)) 
# Print (f.tell ()) 
# f.seek (0,0) Seek bytes # 
# print (f. Read (. 8)) 
# Print (f.tell ()) 
# f.seek (13 is, 0) 
# Print (reached, f.read (. 3)) 
# Print (f.tell ()) 

# 0 mode is possible only mode t using the 
# with open (r'a.txt ',' rt ', encoding =' utf-8 ') as f:
#     print(f.read(3))
#     f.seek(3,3)
Print # (reached, f.read (. 3)) 

# with Open (r'a.txt ',' RB ') AS F: 
# Print (reached, f.read (. 6)) # b'hello \ XE4' 
# f.seek ( 2,1) 
# Print (f.tell ()) 
. Print # (reached, f.read () decode ( 'UTF_8')) 

# with Open (r'a.txt ',' RB ') AS F: 
# F. seek (-3,2) # 3 moves the cursor backwards 
# Print (f.tell ()) 
# f.seek (0,2) to move the cursor directly to the end of the # 

# tail -f access.log # open the file, read additional content 

# Import Time 
# with Open (r'b.txt ',' RB ') AS F: 
# f.seek (0,2) to the end of the cursor # 
# the while True: 
# = f.readline Line ( ) carrying all the data types # Boolean, once the blank is False 
# IF Line: 
# Print (Line, End = '') 
# the else: 
# the time.sleep (0.05)

Open with # (r'b.txt ',' A ', encoding =' UTF-. 8 ') AS F: 
# f.write (' are you My Apple \ n-') 
# f.flush () and write append # immediately save to your hard drive 

# Import Time 
# with Open (r'b.txt ',' rb ') AS f: 
# f.seek (0,2) 
# the while True: 
# f.readline Line = () 
# IF Line: 
# print (line) # 'end =' '' bytes type without any line mean, end = '' is a normal string 
# the else: 
# the time.sleep (0.05) 

# Import Time 
# with Open (r'b. TXT ',' RB ') AS F: 
# f.seek (0,2) 
# the while True: 
# = f.readline Line () 
# IF Line: 
# Print (line.decode (), End =' ') 
# else:
The time.sleep # (0.05) 

# file truncation
Open with # (r'a.txt ',' A ', encoding =' UTF-. 8 ') AS F: 
# f.truncate (. 3) to retain only the first three bytes # 

# Why should function? There is no function to bring trouble 
    # organizational structure is not clear, poor readability 
    # code redundancy 
    # poor scalability 
# What is the function? 
    # Includes a single function tool 
    called after # define 
# Function Category 
    # built-in functions: len (), max (10,100), 
    # custom function: DEF 
# custom function: 
# DEF function (parameter 1, parameter 2, ...): # parameters can not write, but () have a 
# (indentation) '' 'Notes' '' # help (function name) comments must have, but still optional 
# # function body must have 
Alternatively the return value # return # 
# =============== 
# Apple by You are My 
# =============== 

# DEF print_tag (): 
Print # ( '===============') 
# DEF print_msg (): 
# Print ( 'Apple by You are My')

# Print (print_tag) # <function print_tag at 0x00000178BEC54DC8> memory address 
# = equivalent print_tag <function print_tag AT 0x00000178BEC54DC8> 

# print_tag () 
# print_msg () 
# print_tag () 
# '' ' 
# ======== ======= 
# Apple by You are My 
# =============== 
# '' ' 
# DEF print_tag (): 
# Print (' * '* 15) 
# DEF print_msg (): 
# Print ( 'Apple by You are My') 
# print_tag () 
# print_msg () 
# print_tag () 
# '' ' 
# *************** 
# Apple by You are My 
*************** # 
# '' '# high scalability 

# DEF the auth (): 
# name = INPUT (' >> name: ').strip()
#     password=input('password>>:').strip()
IF name == # 'OBOS' and password == '123': 
# Print ( 'successful landing') 
# the else: 
# Print ( 'user name or password is incorrect') 
# 
# auth () 

#-defined functions have taken place in stages what's up? 
#-Defined functions only detect syntax stage, does not execute code. Grammar no problem on the definition of success, does not complain. 

After the first call using # 
# DEF foo (): 
# Print ( 'from foo') 
# bar () 
# DEF bar (): 
# Print ( 'bar from') 

three forms defined function # 
# The first: None function parameter # 
# DEF foo (): 
# DEF bar (): 
# DEF print_tag (): 
# DEF print_msg (): 
# X = 10 
# Y =. 11 
# IF X> = Y: 
# Print ( 'X') 
# the else: 
# Print ( 'Y') 
# The second: YES function parameter 
# my_max DEF (X, Y): 
# IF X> = Y:

The else #: 
# Print (Y) 
# my_max (1,2) 
# DEF the auth (name, password): 
# IF name == 'OBOS' and password == '123': 
# Print ( 'successful login') 
# the else : 
# Print ( 'user name or password is incorrect') 
# 
# DEF Love (): 
# the INPUT name = ( 'name >>:') Strip (). 
# password = the INPUT ( 'password >>:') Strip (. ) 
# the auth (name, password) 
# Love () 
# function as each doing, a function to extract individual 
# third: empty function 
# DEF the auth (): 
# '' ' 
#' '' 
# Pass 
# DEF PUT (): 
# Pass 
# DEF GET (): 
# Pass 
# DEF iS (): 
# Pass 
the organizational structure of the program reflects #