infile = open(filename, 'r')
时间: 2024-01-22 22:02:42 浏览: 24
As an AI language model, I don't have access to your local files, so I cannot provide a specific answer for this question. However, I can explain what the code line `infile = open(filename, 'r')` does in general.
This line of code opens a file with the name specified in the variable `filename` and assigns it to the variable `infile`. The second parameter `'r'` specifies that the file should be opened in read mode. This means that the file can be read from but not written to.
After this line of code, you can perform operations on the file using the `infile` variable, such as reading its contents, iterating over its lines, or closing it when you're done.
相关问题
下面程序实现功能是:统计文本文件中字母字符的个数(不区分大小写)并输出。 def main(): filename = input("Enter a filename: ").strip() fo = open(filename, r) #*****(3) infile = fo.readlines() count=0 for line in infile: line=line.lower #*****(4) for ch in line: if "z">=ch or ch>="a": #*****(5) count+=1 print(count) main()程序改错
以下是修改后的程序:
```
def main():
filename = input("Enter a filename: ").strip()
fo = open(filename, "r") # (3) 文件模式应该用双引号括起来
infile = fo.readlines()
count = 0
for line in infile:
line = line.lower() # (4) line 是字符串,需要加上小括号调用 lower() 方法
for ch in line:
if "z" >= ch >= "a": # (5) 使用 >= 表示区间,字符比较需要用单引号括起来
count += 1
print(count)
main()
```
修改说明:
1. 第 4 行,文件模式应该用双引号括起来。
2. 第 6 行,使用 `readlines()` 方法读取文件的所有行。
3. 第 8 行,`line.lower()` 表示将字符串中所有字母字符转换为小写字母。
4. 第 10 行,使用 `>=` 表示区间,字符比较需要用单引号括起来。
target = open(filename, 'a')
This line of code opens a file named `filename` in append mode.
In append mode, any new data written to the file will be added to the end of the file instead of overwriting the existing content. If the file doesn't exist, it will be created.
The variable `target` is assigned as the file object that can be used to write to the file.