Файл

1.10.1.py

# -*- encoding: utf-8 -*-
"""
Открытие файла
"""

#open() returns a file object, and is most commonly used with two arguments: 
#"open(filename, mode)".

f=open('/tmp/workfile', 'w')
print f

# mode can be 'r' when the file will only be read, 
# 'w' for only writing (an existing file with the same name will be erased), 
# 'a' opens the file for appending; any data written to the file is automatically 
#      added to the end. 
# 'r+' opens the file for both reading and writing. 
# The mode argument is optional; 'r' will be assumed if it's omitted.

# On Windows and the Macintosh, 'b' appended to the mode opens the file in binary 
# mode so there are also modes like 'rb', 'wb', and 'r+b'. 

1.10.2.py

# -*- encoding: utf-8 -*-
"""
Закрытие файла
"""

# Open files consume system resources, and depending on the file mode, 
# other programs may not be able to access them. 

# It's important to close files as soon as you're finished with them, as shown in 
# 

f = open("/music/_singles/kairo.mp3", "rb")        

print f.closed                                     

f.close()                                          
print f 

print f.closed                      

1.10.3.py

# -*- encoding: utf-8 -*-
"""
Чтение из файла
"""

f = open(r'c:\text\somefile.txt')
print f.read()
f.close()

1.10.4.py

# -*- encoding: utf-8 -*-
"""
Чтение строк из файла
"""

f = open("filename")
for line in f.readlines():
    print "Line: " + line

1.10.5.py

# -*- encoding: utf-8 -*-
"""
Запись в файл
"""

f = open(r'c:\text\somefile.txt', 'w')
f.write('this\nis no\nhaiku')
f.close()

1.10.6.py

# -*- encoding: utf-8 -*-
"""
Изменение позиции в файле
"""

f = open('/tmp/workfile', 'r+')
f.write('0123456789abcdef')
f.seek(5)     # Go to the 6th byte in the file
print f.read(1)        

f.seek(-3, 2) # Go to the 3rd byte before the end
print f.read(1)

f.close()

1.10.7.py

# -*- encoding: utf-8 -*-
"""
Запись строк в файл
"""

f = open(r'c:\text\somefile.txt')
lines = f.readlines()
f.close()
lines[1] = "isn't a\n" 
f = open(r'c:\text\somefile.txt', 'w')
f.writelines(lines)
f.close()

1.10.8.py

# -*- encoding: utf-8 -*-
"""
Определение позиции в файле
"""

f = open(r'c:\text\somefile.txt')
f.read(3)
f.read(2)
f.tell()