Python Forum

hi
i read https://realpython.com/introduction-to-p...enerators/
there is a file as techcruch.csv in the above address.
I downloaded it on my desktop, so its address on my PC is: C:\Users\akbar\Desktop\techcruch.csv
in the below code(IDLE):

address=r"C:\Users\akbar\Desktop\techcruch.csv"
def csv_reader(file_name):
    for row in open(file_name, "r"):
        yield row
def y(address):
    csv_gen = csv_reader(address)
    row_count = 0
    for row in csv_gen:
       row_count += 1
    print(f"Row count is {row_count}")


y(address)

the below error is displayed:

Error:
Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
    y(address)
  File "<pyshell#26>", line 5, in y
    for row in csv_gen:
  File "<pyshell#2>", line 2, in csv_reader
    for row in open(file_name, "r"):
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\akbar\\Desktop\\techcruch.csv'

I also did the below tests and you can see what idle showed to me:

address="C:\Users\akbar\Desktop\techcruch.csv"

Error:
SyntaxError: incomplete input

address=r"C:\Users\akbar\Desktop\techcruch.csv"
address

Output:
'C:\\Users\\akbar\\Desktop\\techcruch.csv'

address=f"C:\Users\akbar\Desktop\techcruch.csv"

Error:
SyntaxError: incomplete input

address=r"C:\Users\akbar\Desktop\techcruch.csv"
y(address)

Error:
Traceback (most recent call last):
  File "<pyshell#35>", line 1, in <module>
    y(address)
  File "<pyshell#26>", line 5, in y
    for row in csv_gen:
  File "<pyshell#2>", line 2, in csv_reader
    for row in open(file_name, "r"):
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\akbar\\Desktop\\techcruch.csv'

so what can I do to input the address of the techcruch.csv file to the y function?
thanks

(Oct-19-2023, 06:05 AM)akbarza Wrote: [ -> ]hi
i read https://realpython.com/introduction-to-p...enerators/
there is a file as techcruch.csv in the above address.
I downloaded it on my desktop, so its address on my PC is: C:\Users\akbar\Desktop\techcruch.csv
in the below code(IDLE):

address=r"C:\Users\akbar\Desktop\techcruch.csv"
def csv_reader(file_name):
    for row in open(file_name, "r"):
        yield row
def y(address):
    csv_gen = csv_reader(address)
    row_count = 0
    for row in csv_gen:
       row_count += 1
    print(f"Row count is {row_count}")


y(address)

the below error is displayed:

Error:
Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
    y(address)
  File "<pyshell#26>", line 5, in y
    for row in csv_gen:
  File "<pyshell#2>", line 2, in csv_reader
    for row in open(file_name, "r"):
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\akbar\\Desktop\\techcruch.csv'

I also did the below tests and you can see what idle showed to me:

address="C:\Users\akbar\Desktop\techcruch.csv"

Error:
SyntaxError: incomplete input

address=r"C:\Users\akbar\Desktop\techcruch.csv"
address

Output:
'C:\\Users\\akbar\\Desktop\\techcruch.csv'

address=f"C:\Users\akbar\Desktop\techcruch.csv"

Error:
SyntaxError: incomplete input

address=r"C:\Users\akbar\Desktop\techcruch.csv"
y(address)

Error:
Traceback (most recent call last):
  File "<pyshell#35>", line 1, in <module>
    y(address)
  File "<pyshell#26>", line 5, in y
    for row in csv_gen:
  File "<pyshell#2>", line 2, in csv_reader
    for row in open(file_name, "r"):
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\akbar\\Desktop\\techcruch.csv'

so what can I do to input the address of the techcruch.csv file to the y function?
thanks

no reply yet?

Use / instead of \ . Windows doesn't care, and there is no chance that \U will be interpreted as the start of a unicode character.

If you ran this code in interactive python you get a better error message.

Output:
>>> address="C:\Users\akbar\Desktop\techcruch.csv"
  File "<stdin>", line 1
    address="C:\Users\akbar\Desktop\techcruch.csv"
                                                  ^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

You can escape out of the escape sequence by using \\

Output:
>>> address="C:\\Users\akbar\Desktop\techcruch.csv"
>>> address
'C:\\Users\x07kbar\\Desktop\techcruch.csv'
>>> print(address)
C:\Userskbar\Desktop    echcruch.csv

Oops! \t is a tab escape sequence. May as well escape out of all the backslashes

Output:
>>> address="C:\\Users\\akbar\\Desktop\\techcruch.csv"
>>> print(address)
C:\Users\akbar\Desktop\techcruch.csv

Or you could just use /.

More info on escape sequences here.

https://docs.python.org/3/reference/lexi...-sequences

akbarza Wrote:FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\akbar\\Desktop\\techcruch.csv'

The problem is that you do not have file named techcruch.csv on Desktop.
Python never lies👀 about this.

akbarza Wrote:I downloaded it on my desktop, so its address on my PC is: C:\Users\akbar\Desktop\techcruch.csv

It goes in Downloads folder if not specify or move the file to Desktop.

So it work if i put file with that name on my desktop.

def csv_reader(file_name):
    for row in open(file_name, "r"):
        yield row

def y(address):
    csv_gen = csv_reader(address)
    row_count = 0
    for row in csv_gen:
       row_count += 1
    print(f"Row count is {row_count}")

address = r"C:\Users\tom\Desktop\techcruch.csv"
y(address)

Output:
Row count is 65

Also noteworthy that techcruch.csv appears to be a typo.

/regards