writelines() to write a list to the file in Python

writelines(list)

list : Input data as list .

Using 'w' mode

Details of different mode of file opening is shown here.

fob=open('data5.txt','w')
my_list=['Alex','Ronald','John']
fob.writelines(my_list)
fob.close()
# read data after writing 
fob=open('data5.txt','r')
print(fob.read()) # AlexRonaldJohn

Using 'a' mode

We used the same file as written above. As the mode of file open is 'a' , the data will be added at the end of the file.

fob=open('data5.txt','a')
my_list=['One','Two','Three']
fob.writelines(my_list)
fob.close()

fob=open('data5.txt','r')
print(fob.read()) # AlexRonaldJohnOneTwoThree

By using tell() method we can get the file object position. Here is the code to understand file position after writelines()

fob=open('data5.txt','w')
my_list=['Alex','Ronald','John']
fob.writelines(my_list)
print(fob.tell()) # 14 
fob.close() 
# read data after writing 
fob=open('data5.txt','r')
print(fob.tell()) # 0
print(fob.read()) # AlexRonaldJohn

fob=open('data5.txt','a')
my_list=['One','Two','Three']
fob.writelines(my_list)
print(fob.tell()) # 25
fob.close()

fob=open('data5.txt','r')
print(fob.tell()) # 0 
print(fob.read()) # AlexRonaldJohnOneTwoThree

writable()

File Append File Write

File handling methods list Python- Tutorials

Subhendu Mohapatra

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