opening file in python

python open file

with open('filename', 'a') as f: # able to append data to file
	f.write(var1) # Were var1 is some variable you have set previously
	f.write('data') 
	f.close() # You can add this but it is not mandatory 

with open('filename', 'r') as f: # able to read data from file ( also is the default mode when opening a file in python)

with open('filename', 'x') as f: # Creates new file, if it already exists it will cause it to fail

with open('filename', 't') as f: # opens the file in text mode (also is defualt)

with open('filename', 'b') as f: # Use if your file will contain binary data
  
with open('filename', 'w') as f: # Open file with ability to write, will also create the file if it does not exist (if it exists will cause it to fail)
  
with open('filename', '+') as f: # Opens file with reading and writing

# You can combine these as you like with the + for reading and writing

Posted by: Guest on February-27-2020

document = 'document.txt' file = open(document, 'r') # 'r' to read. it can be replaced with: # 'w' to write (overwrite) # 'a' to append (add to the end) # 'w+' makes a new file if one does not already exist of that name # 'a+' same as 'w+' but appends if the file does exist # 'x' creates file for writing, but fails if file already exists ##go to beginning of document. not required but good for consistency. file.seek(0) ##print all lines in document, except empty lines: for line in file: k = line.strip() print k ##close the file after you are done file.close() ##this also works to open a file, and is more error proof: with open(document) as filestream: for i in filestream: k = i.strip() print k

#there are many modes you can open files in. r means read. file = open('C:Usersyournamefilesfile.txt','r') text = file.read() #you can write a string to it, too! file = open('C:Usersyournamefilesfile.txt','w') file.write('This is a typical string') #don't forget to close it afterwards! file.close()

def main(): f= open("guru99.txt","w+") #f=open("guru99.txt","a+") for i in range(10): f.write("This is line %drn" % (i+1)) f.close() #Open the file back and read the contents #f=open("guru99.txt", "r") #if f.mode == 'r': # contents =f.read() # print (contents) #or, readlines reads the individual line into a list #fl =f.readlines() #for x in fl: #print(x) if __name__== "__main__": main()

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