I am a beginner in Python self studying Python 2.7. May I ask one question I got in line counting codes in Python? How do I intuitively understand why the below works, especially how I can understand what the for loop is doing with the file handle?
Many thanks all
fhand=open('test.txt')
count=0
for line in fhand:
count=count+1
print count
count=0 initializes a count variable with the value of 0.
As you can see in the documentation of the file object, using a for loop will get you the contents of the file line-by-line. (This is because file objects are iterable.)
Each time you get the contents of a line, count=count+1 adds 1 to the count variable.
print count dumps the contents of the count variable.
A file object is an iterator which when used will return each line of the file. Therefore, the count in the for-loop will simply count the number of lines in the file
fhand=open('test.txt') # Opens the file and puts the content of it in the "fhand" variable
count=0 # Creates new variable "count" and sets it to 0
for line in fhand:
count=count+1 # Increase count by 1 for every line in the file
print count # Prints the amount of lines
In Python, when you open the file, you are getting access to its contents.
fhand=open('test.txt')
The above does the job.
count=0
When you initialize count to 0, that means the variable is set to value 0, and once it enters the loop,
count=count+1
adds +1 to it every time.
for line in fhand
Above code is for iteration. It loops over each and every line of the file fhand and for every iteration, it adds +1 to count.
When the iteration is complete, the value of count is set, which you print later to get the count of number of lines.
