如何解决Python - for 循环内的变量在循环外消失
编辑:如果您也遇到过这个问题,下面有两种可能的解决方案。
我正在制作一个非常简单的 Python 脚本来合并多个 Markdown 文件,同时保留所有换行符。我要合并的文件名为 markdown/simple1.md
、markdown/simple2.md
和 markdown/simple3.md
(它们位于名为 markdown/
的文件夹中。
Page 1
This is some useless content
Page 2
This is some useless content
Page 3
This is some useless content
这是我目前所拥有的:
# Define files I want to merge
filenames = ['markdown/simple1.md','markdown/simple2.md','markdown/simple3.md']
# Merge markdown files into one big file
merged_filecontent = ""
file = ""
for file in filenames:
file = open(file).read()
file += "\n"
# print(file)
merged_filecontent = file
print(merged_filecontent)
这完美地工作。但是,一旦我尝试在 for
循环之外调用变量,如下所示:
# Define files I want to merge
filenames = ['markdown/simple1.md','markdown/simple3.md']
# Merge markdown files into one big file
merged_filecontent = ""
file = ""
for file in filenames:
file = open(file).read()
file += "\n"
# print(file)
merged_filecontent = file
# Call variable outside of for loop
print(merged_filecontent)
该变量只返回第 3 个 Markdown 文件,不显示合并后的文件。
如果您能对此问题提供帮助,我将不胜感激。
解决方法
您正在循环内重新声明 file
变量。试试:
filenames = ['markdown/simple1.md','markdown/simple2.md','markdown/simple3.md']
merged_filecontent = ""
for file in filenames:
with open(file) as f:
merged_filecontent += f.read()+"\n"
print(merged_filecontent)
,
您需要实际将文件内容与 foreach(var element in Model.MyList) {
statements
}
merged_filecontent += file
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