Let's say I have a text file containing the following details:
name1,address,more details
name2,address,more details
name3,address,more details
I take an input and it finds the row like this:
name = str(input("Enter Name to delete record:\n"))
with open("theFile.txt", "r") as file:
for x in file:
seperated = x.split(',')
if seperated[0] == name:
print(x)
This prints the whole row of the details. Now here's the part I'm stuck on. How can I delete this row? I've tried this but it doesn't do anything to the file.
with open("theFile.txt", "r") as file:
lines = file.readlines()
with open("theFile.txt", "w") as file:
for line in lines:
if line.strip("\n") != x:
file.write(line)
else:
print("Row removed")
I've seen other posts where you can remove the row by comparing it to the whole row but how can I do this by comparing the first index only?
One way is:
with open("theFile.txt") as f:
items = list(f)
name = input("Enter Name to delete record:\n") # input is always a string
with open("theFile.txt", "w") as f:
[f.write(x) for x in items if not x.split(",")[0] == name]
The last line can also be written as:
for line in items:
parts = line.split(",")
if not parts[0] == name:
f.write(line)
Demo
It should work like this:
name = str(input("Enter Name to delete record:\n"))
lines=[]
with open("theFile.txt", 'r') as file:
for x in file:
seperated = x.split(',')
if seperated[0] == name:
print(seperated)
print("Row removed")
else:
lines.append(x)
with open("theFile.txt", "w") as file:
for line in lines:
print(line)
file.write(line)
name = str(input("Enter Name to delete record:\n"))
all_lines=[]
with open("theFile.txt", "r") as file:
for x in file:
all_lines.append(x.strip("\n"))
for line in all_lines:
seperated = line.split(',')
if seperated[0] == name:
all_lines.remove(line)
print("Row removed")
with open("theFile.txt","w") as f:
for line in all_lines:
f.write(str(line)+"\n")
Related
def add():
while True:
try:
a = int(input("How many words do you want to add:"))
if a >= 0:
break
else:
raise ValueError
except ValueError:
print("Not valid ")
return a
for i in range(add()):
key_i = input(f"Turkish meaning: {i + 1}: ")
value_i = input("translated version: ")
with open('words.txt', 'a+') as f:
f.write("'"+key_i+':')+ f.write(value_i+"'"+",")
My goal is to create my own dictionary,but I am adding a list into the txt file, so it is added into the txt file like this
words = {'araba:kol',
but when I search the txt file it gives me the whole list
def search():
while 1:
search = str(input("Search: "))
if search not in["exit", "Exit"]:
with open('words.txt', 'r+') as f:
line = f.readline()
while line:
data = line.find(search)
if not data == -1:
print(line.rstrip('\n'))
line = f.readline()
else:
line = f.readline()
else:
break
f.close()
What can I do to make it output like this
car:araba
Use JSON module to avoid having to write the dictionary line by line yourself.
import json
with open('words.json', 'a+') as f:
json.dump({key_i: value_i}, f)
with open('data.json', 'r') as f:
d2 = json.load(f)
d2 is now the data that you wrote to the file.
Note, that you should change the a+ to 'w' as you only have one dictionary per file.
I used this code to delete a word from a text file.
f = open('./test.txt','r')
a = ['word1','word2','word3']
lst = []
for line in f:
for word in a:
if word in line:
line = line.replace(word,'')
lst.append(line)
f.close()
f = open('./test.txt','w')
for line in lst:
f.write(line)
f.close()
But for some reason if the words have the same characters, all those characters get deleted. So for e.g
in my code:
def cancel():
global refID
f1=open("refID.txt","r")
line=f1.readline()
flag = 0
while flag==0:
refID=input("Enter the reference ID or type 'q' to quit: ")
for i in line.split(','):
if refID == i:
flag=1
if flag ==1:
print("reference ID found")
cancelsub()
elif (len(refID))<1:
print("Reference ID not found, please re-enter your reference ID\n")
cancel()
elif refID=="q":
flag=1
else:
print("reference ID not found\n")
menu()
def cancelsub():
global refIDarr, index
refIDarr=[]
index=0
f = open('flightbooking.csv')
csv_f = csv.reader(f)
for row in csv_f:
refIDarr.append(row[1])
for i in range (len(refIDarr)):
if refID==refIDarr[i]:
index=i
print(index)
while True:
proceed=input("You are about to cancel your flight booking, are you sure you would like to proceed? y/n?: ")
while proceed>"y" or proceed<"n" or (proceed>"n" and proceed<"y") :
proceed=input("Invalid entry. \nPlease enter y or n: ")
if proceed=="y":
Continue()
break
elif proceed=="n":
main_menu
break
exit
break
def Continue():
lines = list()
with open('flightbooking.csv', 'r') as readFile:
reader = csv.reader(readFile)
for row in reader:
lines.append(row)
for field in row:
if field ==refID:
lines.remove(row)
break
with open('flightbooking.csv', 'w') as writeFile:
writer = csv.writer(writeFile)
writer.writerows(lines)
f = open('refID.txt','r')
a=refIDarr[index]
print(a)
lst = []
for line in f:
for word in a:
if word in line:
line = line.replace(word,'')
lst.append(line)
print(lst)
f.close()
f = open('refID.txt','w')
for line in lst:
f.write(line)
f.close()
print("Booking successfully cancelled")
menu()
When the code is run, the refID variable has one word stored in it, and it should replace just that word with a blank space, but it takes that word for e.g 'AB123', finds all other words which might have an 'A' or a 'B' or the numbers, and replace all of them. How do I make it so it only deletes the word?
Text file before running code:
AD123,AB123
Expected Output in the text file:
AD123,
Output in text file:
D,
Edit: I have added the entire code, and maybe you can help now after seeing that the array is being appended to and then being used to delete from a text file.
here's my opinion.
refIDarr = ["AB123"]
a = refIDarr[0] => a = "AB123"
strings in python are iterable, so when you do for word in a, you're getting 5 loops where each word is actually a letter.
Something like the following is being executed.
if "A" in line:
line = line.replace("A","")
if "B" in line:
line = line.replace("B","")
if "1" in line:
line = line.replace("1","")
if "2" in line:
line = line.replace("2","")
if "3" in line:
line = line.replace("3","")
they correct way to do this is loop over refIDarr
for word in refIDarr:
line = line.replace(word,'')
NOTE: You don't need the if statement, since if the word is not in the line it will return the same line as it was.
"abc".replace("bananan", "") => "abc"
Here's a working example:
refIDarr = ["hello", "world", "lol"]
with open('mytext.txt', "r") as f:
data = f.readlines()
for word in refIDarr:
data = [line.replace(word, "") for line in data]
with open("mytext.txt", "w") as newf:
newf.writelines(data)
The problem is here:
a=refIDarr[index]
If refIDarr is a list of words, accessing specific index makes a be a word. Later, when you iterate over a (for word in a:), word becomes a letter and not a word as you expect, which causes eventually replacing characters of word instead the word itself in your file.
To avoid that, remove a=refIDarr[index] and change your loop to be:
for line in f:
for word in refIDarr:
if word in line:
line = line.replace(word,'')
Every time I write a code I keep getting error. here is the code I have
def main():
outflow = open("studentList.txt", "r")
for line in outflile:
line[:-1].split(" ")
print(line)
main()
If your studentList file contain the name of the student one per each line so the way of reading is:
def main():
noOfStudents = 0
outflow = open("studentList.txt", "r")
for line in outflow:
noOfStudents+=1
print(line.rstrip("\n"))
print("Total no of students is :", noOfStudents)
outflow.close()
main()
Output:
student A
student B
student C
Total no of students is : 3
If students names are in line by line in the text file then use this
filename = "studentList.txt"
with open(filename) as f:
lines = f.read().splitlines()
print(lines)
or if students names are separated from space then use the following one
filename = "studentList.txt"
with open(filename, 'r') as f:
lines = f.read().encode("utf-8").replace(" ", "\n")
print(lines)
you do not have any outflile (probably a typo) difined this will raise NameError, so you can use:
def main():
outflow = open("studentList.txt", "r")
for line in outflow:
line[:-1].split(" ")
print(line)
main()
even better:
with open("studentList.txt", "r") as outflow:
for line in outflow:
line = line.rstrip().split(" ")
print(line)
def false_to_true():
name = input("Input name: ")
file=open("users.txt","r")
lines = file.readlines()
file.close()
for line in lines:
username, lel, type = line.split("/")
while name == username:
name = input("input name again: ")
tip = True
with open("users.txt", "w") as users:
users.write(str(red))
#
#I do not know how to perform a given modification and enrollment into place in #the text.
#
#I wont to change word False to True for username i input.
#I have this text in file users:
#Marko123/male/False
#Mimi007/female/False
#John33/male/False
#Lisa12/female/False
#Inna23/female/False
#Alisa27/female/False
I won't to change word False to True for username I input.
I have this text in file users:
Marko123/male/False
Mimi007/female/False
John33/male/False
Lisa12/female/False
Inna23/female/False
Alisa27/female/False
You can just use the csv library and forget about string manipulation:
import csv
def false_to_true():
#read from user.txt file into list(data)
with open('users.txt', 'r') as userfile:
data = [row for row in csv.reader(userfile,
delimiter="/",
quoting=csv.QUOTE_NONE)]
while True:
#waiting for input until you enter nothing and hit return
username = input("input name: ")
if len(username) == 0:
break
#look for match in the data list
for row in data:
if username in row:
#change false to true
row[2] = True
#assuming each username is uniqe break out this for loop
break
#write all the changes back to user.txt
with open('users.txt', 'w', newline='\n') as userfile:
dataWriter = csv.writer(userfile,
delimiter="/",
quoting=csv.QUOTE_NONE)
for row in data:
dataWriter.writerow(row)
if __name__ == '__main__':
false_to_true()
Open the input and output files, make a set out of the user-input names (terminated by a blank line), then create a generator for strings of the proper format that check for membership in the user-input names, then write these lines to the output file:
with open('names.txt') as f, open('result.txt', 'w') as out:
names = {name for name in iter(input, '')}
f = ('{}/{}/{}'.format(a,b,'True\n' if a in names else c) for a,b,c in (line.split('/') for line in f))
output.writelines(f)
To modify a text file inplace, you could use fileinput module:
#!/usr/bin/env python3
import fileinput
username = input('Enter username: ').strip()
with fileinput.FileInput("users.txt", inplace=True, backup='.bak') as file:
for line in file:
if line.startswith(username + "/"):
line = line.replace("/False", "/True")
print(line, end='')
See How to search and replace text in a file using Python?
Ask for name and iterate throw your lines to check for username, like this:
def false_to_true():
name = input("Input name: ")
file=open("users.txt","r")
lines = file.readlines()
file.close()
users = open("users.txt", "w")
for line in lines:
username, lel, type = line.split("/")
if name == username:
type = 'True\n'# \n for new line type ends with '\n'
users.write("/".join([username, lel, type]))
users.close()
false_to_true()
I'm new to python and programming. I need some help with a python script. There are two files each containing email addresses (more than 5000 lines). Input file contains email addresses that I want to search in the data file(also contains email addresses). Then I want to print the output to a file or display on the console. I search for scripts and was able to modify but I'm not getting the desired results. Can you please help me?
dfile1 (50K lines)
yyy#aaa.com
xxx#aaa.com
zzz#aaa.com
ifile1 (10K lines)
ccc#aaa.com
vvv#aaa.com
xxx#aaa.com
zzz#aaa.com
Output file
xxx#aaa.com
zzz#aaa.com
datafile = 'C:\\Python27\\scripts\\dfile1.txt'
inputfile = 'C:\\Python27\\scripts\\ifile1.txt'
with open(inputfile, 'r') as f:
names = f.readlines()
outputlist = []
with open(datafile, 'r') as fd:
for line in fd:
name = fd.readline()
if name[1:-1] in names:
outputlist.append(line)
else:
print "Nothing found"
print outputlist
New Code
with open(inputfile, 'r') as f:
names = f.readlines()
outputlist = []
with open(datafile, 'r') as f:
for line in f:
name = f.readlines()
if name in names:
outputlist.append(line)
else:
print "Nothing found"
print outputlist
Maybe I'm missing something, but why not use a pair of sets?
#!/usr/local/cpython-3.3/bin/python
data_filename = 'dfile1.txt'
input_filename = 'ifile1.txt'
with open(input_filename, 'r') as input_file:
input_addresses = set(email_address.rstrip() for email_address in input_file.readlines())
with open(data_filename, 'r') as data_file:
data_addresses = set(email_address.rstrip() for email_address in data_file.readlines())
print(input_addresses.intersection(data_addresses))
mitan8 gives the problem you have, but this is what I would do instead:
with open(inputfile, "r") as f:
names = set(i.strip() for i in f)
output = []
with open(datafile, "r") as f:
for name in f:
if name.strip() in names:
print name
This avoids reading the larger datafile into memory.
If you want to write to an output file, you could do this for the second with statement:
with open(datafile, "r") as i, open(outputfile, "w") as o:
for name in i:
if name.strip() in names:
o.write(name)
Here's what I would do:
names=[]
outputList=[]
with open(inputfile) as f:
for line in f:
names.append(line.rstrip("\n")
myEmails=set(names)
with open(outputfile) as fd, open("emails.txt", "w") as output:
for line in fd:
for name in names:
c=line.rstrip("\n")
if name in myEmails:
print name #for console
output.write(name) #for writing to file
I think your issue stems from the following:
name = fd.readline()
if name[1:-1] in names:
name[1:-1] slices each email address so that you skip the first and last characters. While it might be good in general to skip the last character (a newline '\n'), when you load the name database in the "dfile"
with open(inputfile, 'r') as f:
names = f.readlines()
you are including newlines. So, don't slice the names in the "ifile" at all, i.e.
if name in names:
I think you can remove name = fd.readline() since you've already got the line in the for loop. It'll read another line in addition to the for loop, which reads one line every time. Also, I think name[1:-1] should be name, since you don't want to strip the first and last character when searching. with automatically closes the files opened.
PS: How I'd do it:
with open("dfile1") as dfile, open("ifile") as ifile:
lines = "\n".join(set(dfile.read().splitlines()) & set(ifile.read().splitlines())
print(lines)
with open("ofile", "w") as ofile:
ofile.write(lines)
In the above solution, basically I'm taking the union (elements part of both sets) of the lines of both the files to find the common lines.