# read *.txt file demo
2019年2月19日10:14
```python
# It is a good idea to store the filename into a variable.
# The variable can later become a function argument when the
# code is converted to a function body.
filename = 'data.txt'
# Using the newer with construct to close the file automatically.
with open(filename) as f:
data = f.readlines()
```
### Or using the older approach and closing the filea explicitly.
```python
# Here the data is re-read again, do not use both ;)
f = open(filename)
data = f.readlines()
f.close()
# The data is of the list type. The Python list type is actually
# a dynamic array. The lines contain also the \n; hence the .rstrip()
for n, line in enumerate(data, 1):
print '{:2}.'.format(n), line.rstrip()
print '-----------------'
```
### You can later iterate through the list for other purpose
```python
# for example to read them via the csv.reader.
import csv
reader = csv.reader(data)
for row in reader:
print row
```
来自 <https://stackoverflow.com/questions/10393176/is-there-a-way-to-read-a-txt-file-and-store-each-line-to-memory>