Code
text = ["300000", "300001", "500000", "500001"]
cnt = 0
for line in f:
if text in line:
print(line.strip())
cnt += 1
if cnt:
print(cnt, "count")
else:
print(text, "No data.")
Error:
Traceback (most recent call last):
File "C:/Users/users/PycharmProjects/Mining/Test Folder/Test2.py", line 10, in <module>
if text in line:
TypeError: 'in <string>' requires string as left operand, not list
Why this error occurs?
The in keyword is used to check if a certain value is inside a collection.
If you want to know if line is in the list text, switch your operands:
text = ["300000", "300001", "500000", "500001"]
cnt = 0
for line in f:
if line in text:
print(line.strip())
If you want to know if any of the strings in the list text is inside/a substring of line:
text = ["300000", "300001", "500000", "500001"]
cnt = 0
for line in f:
if any([i in line for i in text]):
print(line.strip())
You need to understand how 'in' works in python.
Example:
> "abc" in ["pqr", "xyz", "abc"]
True
Here I am testing if string "abc" exist in the list mentioned on the right side of 'in' which is ["pqr", "xyz", "abc"]
But you are checking for the existence of a list (text in your code) inside another list (line in your code).
Hence, as the error says 'in requires string as left operand' but you supplied a list.
Why this error occurs? and I answered that, explaining why that error occurs. Can you please let me know why this is not the answer
fhere?lineis a string object andtextis a list object, You are checking whether string contains list.