{"id":1975,"date":"2020-12-28T09:50:26","date_gmt":"2020-12-28T09:50:26","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=1975"},"modified":"2020-12-28T09:56:33","modified_gmt":"2020-12-28T09:56:33","slug":"python-string-join","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-string-methods\/python-string-join\/","title":{"rendered":"Python String join()"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to use the Python String join()<\/code> method to concatenate strings in an iterable into one string.<\/p>\n\n\n\n

Introduction to the Python String join() method #<\/a><\/h2>\n\n\n\n

The string join()<\/code> method returns a string<\/a> which is the concatenation of strings<\/a> in an iterable<\/a> such as a tuple<\/a>, a list<\/a>, a dictionary<\/a>, and a set<\/a>.<\/p>\n\n\n\n

The following shows the syntax of the join()<\/code> method:<\/p>\n\n\n

str<\/span>.join<\/span>(iterable<\/span>)<\/code><\/span>Code language:<\/span> CSS<\/span> (<\/span>css<\/span>)<\/span><\/small><\/pre>\n\n\n
The str<\/code> will be the separator between elements in the result string.<\/p>\n\n\n\n
If the iterable<\/code> contains any non-string value, the join()<\/code> method will raise a TypeError<\/code>. To fix it, you need to convert non-string values to strings before calling the join()<\/code> method.<\/p>\n\n\n\n
Python string join examples #<\/a><\/h2>\n\n\n\n
Let’s take some examples of using the string join()<\/code> method.<\/p>\n\n\n\n
1) Using string join() method to concatenate multiple strings into a string #<\/a><\/h3>\n\n\n\n
The following example uses the string join()<\/code> method to concatenate a tuple of strings without a separator:<\/p>\n\n\n
colors = ('red'<\/span>, 'green'<\/span>, 'blue'<\/span>)\nrgb = ''<\/span>.join(colors)\nprint<\/span>(rgb)<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
redgreenblue<\/code><\/span><\/pre>\n\n\n
The following example uses the string join()<\/code> method with the comma separator (,<\/code>):<\/p>\n\n\n
colors = ('red'<\/span>, 'green'<\/span>, 'blue'<\/span>)\nrgb = ','<\/span>.join(colors)\nprint<\/span>(rgb)<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
red,green,blue<\/code><\/span><\/pre>\n\n\n
2) Using string join() method to concatenate non-string data into a string #<\/a><\/h3>\n\n\n\n
The following example uses the join()<\/code> method to concatenate strings and numbers in a tuple to a single string:<\/p>\n\n\n
product = ('Laptop'<\/span>, 10<\/span>, 699<\/span>)\nresult = ','<\/span>.join(product)\nprint<\/span>(result)<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
TypeError<\/span>: sequence item 1<\/span>: expected str instance, int found<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
It issued a TypeError<\/code> because the tuple product<\/code> has two integers.<\/p>\n\n\n\n
To concatenate elements in the tuple, you’ll need to convert them into strings before concatenating. For example:<\/p>\n\n\n
product = ('Laptop'<\/span>, 10<\/span>, 699<\/span>)\nresult = ','<\/span>.join(str(d) for<\/span> d in product)\nprint<\/span>(result)<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
Laptop,10,699<\/code><\/span><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
The join()<\/code> method has many practical applications. For example, you can use the join()<\/code> method to compose a row for a CSV file<\/a>.<\/p>\n\n\n\n