python a.all()
时间: 2023-09-22 17:11:27 浏览: 37
The `a.all()` method in Python returns `True` if all elements of the given iterable `a` are true, and `False` otherwise.
For example:
```python
a = [True, True, False, True]
print(a.all()) # Output: False
b = [1, 2, 3, 4]
print(b.all()) # Output: True
c = [0, '', False]
print(c.all()) # Output: False
```
In the first example, the `a` list contains a `False` value, so `a.all()` returns `False`. In the second example, all elements of the `b` list are non-zero, so `b.all()` returns `True`. In the third example, the `c` list contains a `False` value (i.e., `0`), so `c.all()` returns `False`.
相关问题
Python re.findall
The `re.findall()` function is a method in Python's built-in `re` module used to search for all non-overlapping occurrences of a regular expression pattern in a given string and return a list of all matched substrings.
The syntax of `re.findall()` is as follows:
```python
re.findall(pattern, string, flags=0)
```
Here, `pattern` is the regular expression pattern to search for, `string` is the input string to search in, and `flags` (optional) is an integer value that can modify the behavior of the regular expression pattern.
The `re.findall()` function returns a list containing all the matched substrings in the order they were found in the input string. If there are no matches, an empty list is returned.
Example usage:
```python
import re
text = "The quick brown fox jumps over the lazy dog"
matches = re.findall(r"\b\w{3}\b", text)
print(matches)
# Output: ['The', 'fox', 'the', 'dog']
```
In this example, the regular expression pattern `\b\w{3}\b` searches for all three-letter words in the input string `text`. The `re.findall()` function returns a list of all matched substrings, which are the words "The", "fox", "the", and "dog".
python 解压.a文件
以下是使用pyunpack库解压.a文件的Python代码示例:
```python
from pyunpack import Archive
Archive('example.a').extractall('/destination/directory')
```
其中,'example.a'是待解压的.a文件的文件名,'/destination/directory'是解压后文件的存储路径。
另外,如果你想使用Python标准库中的zipfile模块解压.zip文件,可以使用以下代码:
```python
import zipfile
with zipfile.ZipFile('example.zip', 'r') as zip_ref:
zip_ref.extractall('/destination/directory')
```
其中,'example.zip'是待解压的.zip文件的文件名,'/destination/directory'是解压后文件的存储路径。
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