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A D Vishnu Prasad
2020-05-29 19:15:25 +05:30
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Notes/01_Introduction/06_Files.md
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@@ -1,8 +1,8 @@
[Contents](../Contents) \| [Previous (1.5 Lists)](05_Lists) \| [Next (1.7 Functions)](07_Functions)
[Contents](../Contents.md) \| [Previous (1.5 Lists)](05_Lists.md) \| [Next (1.7 Functions)](07_Functions.md)
# 1.6 File Management
Most programs need to read input from somewhere. This section discusses file access.
Most programs need to read input from somewhere. This section discusses file access.
### File Input and Output
@@ -63,7 +63,7 @@ Read a file line-by-line by iterating.
```python
with open(filename, 'rt') as file:
for line in file:
# Process the line
# Process the line
```
### Common Idioms for Writing to a File
@@ -168,7 +168,7 @@ of column headers).
>>>
```
`next()` returns the next line of text in the file. If you were to call it repeatedly, you would get successive lines.
`next()` returns the next line of text in the file. If you were to call it repeatedly, you would get successive lines.
However, just so you know, the `for` loop already uses `next()` to obtain its data.
Thus, you normally wouldn’t call it directly unless you’re trying to explicitly skip or read a single line as shown.
@@ -234,7 +234,7 @@ Data scientists are quick to point out that libraries like
[Pandas](https://pandas.pydata.org) already have a function for
reading CSV files. This is true--and it works pretty well.
However, this is not a course on learning Pandas. Reading files
is a more general problem than the specifics of CSV files.
is a more general problem than the specifics of CSV files.
The main reason we're working with a CSV file is that it's a
familiar format to most coders and it's relatively easy to work with
directly--illustrating many Python features in the process.
@@ -242,4 +242,4 @@ So, by all means use Pandas when you go back to work. For the
rest of this course however, we're going to stick with standard
Python functionality.
[Contents](../Contents) \| [Previous (1.5 Lists)](05_Lists) \| [Next (1.7 Functions)](07_Functions)
[Contents](../Contents.md) \| [Previous (1.5 Lists)](05_Lists.md) \| [Next (1.7 Functions)](07_Functions.md)