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Why is this not reading what is in the file? Python [duplicate]

0

This question already has an answer here:

• 
  Read from file after write, before closing
  
  3 answers
  
  

f = open("work.txt","a+")

a = input("number ")

print(a, "before file")

f.write(a)

contents = f.read()
print(contents)

f.close

python

share|improve this question

edited Mar 21 at 19:16

blhsing

41.3k41743

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

marked as duplicate by Aran-Fey python
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Mar 21 at 19:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please add an explanation of the problem in your question even if it is the same as the title, not just code.
  
  – Ctrl S
  Mar 21 at 19:12
  
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  Read from file after write, before closing
  
  3 answers
  
  

f = open("work.txt","a+")

a = input("number ")

print(a, "before file")

f.write(a)

contents = f.read()
print(contents)

f.close

python

share|improve this question

edited Mar 21 at 19:16

blhsing

41.3k41743

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

marked as duplicate by Aran-Fey python
Users with the  python badge can single-handedly close python questions as duplicates and reopen them as needed.

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Mar 21 at 19:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please add an explanation of the problem in your question even if it is the same as the title, not just code.
  
  – Ctrl S
  Mar 21 at 19:12
  
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Read from file after write, before closing
  
  3 answers
  
  

f = open("work.txt","a+")

a = input("number ")

print(a, "before file")

f.write(a)

contents = f.read()
print(contents)

f.close

python

share|improve this question

edited Mar 21 at 19:16

blhsing

41.3k41743

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

f = open("work.txt","a+")

a = input("number ")

print(a, "before file")

f.write(a)

contents = f.read()
print(contents)

f.close

share|improve this question

edited Mar 21 at 19:16

blhsing

41.3k41743

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

share|improve this question

edited Mar 21 at 19:16

blhsing

41.3k41743

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

edited Mar 21 at 19:16

blhsing

41.3k41743

edited Mar 21 at 19:16

blhsing

41.3k41743

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

asked Mar 21 at 19:09

Its LittlebossIts Littleboss

6

2 Answers
2

active

oldest

votes

1

The file is opened in append mode so the file pointer is at the end of the file when you attempt to read it. You should do a file seek to the beginning of the file if you intend to read the entire file after writing:

f = open("work.txt","a+")
a = input("number ")
print(a, "before file")
f.write(a)
f.seek(0)
contents = f.read()
print(contents)
f.close()

share|improve this answer

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

add a comment | 

0

"a+" opens the file in append/read mode, which means the file pointer is at the end of the file when first opened. The write appends to the file, but file pointer remains at the end after the write. You need to seek somewhere earlier in the file for f.read to return anything.

share|improve this answer

answered Mar 21 at 19:12

chepnerchepner

259k34249343

add a comment | 

1

The file is opened in append mode so the file pointer is at the end of the file when you attempt to read it. You should do a file seek to the beginning of the file if you intend to read the entire file after writing:

f = open("work.txt","a+")
a = input("number ")
print(a, "before file")
f.write(a)
f.seek(0)
contents = f.read()
print(contents)
f.close()

share|improve this answer

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

add a comment | 

1

The file is opened in append mode so the file pointer is at the end of the file when you attempt to read it. You should do a file seek to the beginning of the file if you intend to read the entire file after writing:

f = open("work.txt","a+")
a = input("number ")
print(a, "before file")
f.write(a)
f.seek(0)
contents = f.read()
print(contents)
f.close()

share|improve this answer

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

add a comment | 

The file is opened in append mode so the file pointer is at the end of the file when you attempt to read it. You should do a file seek to the beginning of the file if you intend to read the entire file after writing:

f = open("work.txt","a+")
a = input("number ")
print(a, "before file")
f.write(a)
f.seek(0)
contents = f.read()
print(contents)
f.close()

share|improve this answer

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

f = open("work.txt","a+")
a = input("number ")
print(a, "before file")
f.write(a)
f.seek(0)
contents = f.read()
print(contents)
f.close()

share|improve this answer

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

answered Mar 21 at 19:11

blhsingblhsing

41.3k41743

0

"a+" opens the file in append/read mode, which means the file pointer is at the end of the file when first opened. The write appends to the file, but file pointer remains at the end after the write. You need to seek somewhere earlier in the file for f.read to return anything.

share|improve this answer

answered Mar 21 at 19:12

chepnerchepner

259k34249343

add a comment | 

0

"a+" opens the file in append/read mode, which means the file pointer is at the end of the file when first opened. The write appends to the file, but file pointer remains at the end after the write. You need to seek somewhere earlier in the file for f.read to return anything.

share|improve this answer

answered Mar 21 at 19:12

chepnerchepner

259k34249343

add a comment | 

"a+" opens the file in append/read mode, which means the file pointer is at the end of the file when first opened. The write appends to the file, but file pointer remains at the end after the write. You need to seek somewhere earlier in the file for f.read to return anything.

share|improve this answer

answered Mar 21 at 19:12

chepnerchepner

259k34249343

share|improve this answer

answered Mar 21 at 19:12

chepnerchepner

259k34249343

answered Mar 21 at 19:12

chepnerchepner

259k34249343

answered Mar 21 at 19:12

chepnerchepner

259k34249343