将转义字符 (\\n) 添加到字符串元组中的最后一个元素

Question

I have a tuple of strings like this:

stringTuple = ['String1', 'String2', 'String3', 'String4', 'String5', 'String6']

I later combine this tuple with multiple others and input into an excel document. I need new line break between each of these tuples - so I need it to look like this.

stringTuple = ['String1', 'String2', 'String3', 'String4', 'String5', 'String6\\n']

I've looked into different sorts of string concatenation such as: stringTuple[-1:] = stringTuple[-1:] + '\\n' with no luck

Answer 1

The last element in your list is stringTuple[-1] .

Add a line break to the last element in your list:

stringTuple[-1] = stringTuple[-1] + "\n"

Or just:

stringTuple[-1] += "\n"

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By the way, stringTuple[-1:] is a slice of your array (an interesting read is in another SO question, Understanding slice notation ). stringTuple[start:] yields a list of all the items in a list, from index start onwards. In this case, stringTuple[-1:] is a list of all your items from the last index onwards (ie a list of the last item in your original list):

stringTuple = ['String1', 'String2', 'String3', 'String4', 'String5', 'String6']

print(stringTuple[-1:]) # ['String6']

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Making this work with tuples

Tuples are immutable, so you can't make modifications in place (if you want to modify items in a tuple, you actually need to create a new tuple with the modified items in it):

stringTuple = ('String1', 'String2', 'String3', 'String4', 'String5', 'String6')

# get last item in tuple, add line break to it
lastItemWithLineBreak = stringTuple[-1] + "\n"

# create a new tuple consisting of every item in our original list but the last
# and then add our new modified item to the end
newTuple = tuple(i for i in stringTuple[:-1]) + (lastItemWithLineBreak,)

print(newTuple) # ('String1', 'String2', 'String3', 'String4', 'String5', 'String6\n')

Note the special notation (lastItemWithLineBreak,) , which is used to create a tuple consisting of the single element lastItemWithLineBreak .

Answer 2

简单的解决方案，为元组的最后一个元素添加结束行：

stringTuple[-1] += '\n'