10 examples of ‘python read json file line by line’ in Python
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191 def load_jsonlines(file_name, file_path): 192 """Load a jsonlines file, yielding data line by line. 193 194 Parameters 195 ---------- 196 file_name : str 197 File from which to load data. 198 file_path : str 199 Path to directory from which to load. 200 201 Yields 202 ------ 203 dict 204 Dictionary of data loaded from file. 205 """ 206 207 with open(fpath(file_path, fname(file_name, 'json')), 'r') as f_obj: 208 209 while True: 210 211 # Load each line, as JSON file 212 try: 213 yield load_json(f_obj, '') 214 215 # Break off when get a JSON error - end of the file 216 except JSONDecodeError: 217 break
116 def json_loads(line): 117 return json.loads(line.decode("utf-8","ignore"))
34 def load_lines(input_file): 35 with open(input_file, 'r') as read: 36 lines = read.read() 37 return lines
224 def _read_json(self, input_file): 225 with open(input_file, "r", encoding="utf-8") as fin: 226 lines = fin.readlines() 227 return lines
77 def _find_line(string, file_name): 78 """ 79 find the first occurence of a string in a file 80 """ 81 82 with open(file_name, 'r') as fi: 83 for line in fi: 84 if string in line: 85 return line
43 def read_data(log_file): 44 """ 45 Read, parse and return the JSON data for the given log file name. 46 (As a side effect sets the global _last_log_file to the log file name.) 47 """ 48 global _last_log_file 49 try: 50 with open(log_file, "r") as f: 51 f.readline() 52 data = json.load(f) 53 # Keep track of the current log file in global variable in case we need to 54 # identify it later if there's a problem. (This works because the files are 55 # processed lazily.) 56 _last_log_file = log_file 57 except IOError: 58 sys.exit("Could not read log file %s" % log_file) 59 return data
42 def read_line(filename): 43 """help function to read a single line from a file. returns none""" 44 try: 45 f = open(filename) 46 line = f.readline().strip() 47 f.close() 48 return line 49 except IOError: 50 return None
24 def load_json(self,json_file_path): 25 fin = open(json_file_path,"r") 26 try: 27 json_obj = json.load(fin) 28 self.log4py.info("加载了%s文件"%json_file_path) 29 except ValueError, e: 30 json_obj = <> 31 fin.close() 32 return json_obj
48 def read_line(self, line): 49 """Read in a single line and return a (directive, arguments) tuple""" 50 directive, arguments = line.split(':') 51 arguments = [a.strip() for a in arguments.split('->')] 52 self.read_directive(directive.strip(), *arguments)
60 def _read_file_lines(file_): 61 """Read lines of file 62 file_: either path to file or a file (like) object. 63 Return list of lines read or 'None' if file does not exist. 64 """ 65 cont_str = _read_file(file_) 66 if cont_str is None: 67 return None 68 return [url_str.rstrip() for url_str in cont_str.splitlines()]
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How to Extract Data from JSON File in Python?
In this tutorial, you will learn how to parse JSON file and extract data from file in python? We will look at how we can use ‘json’ module to read the json object and get the value from json array?
The JSON stands for JavaScript Object Notation and it is a very popular lightweight data-interchanging format. We use the JSON to serialize the data have a key pair value data. The JSON object same looks like dictionaries in python.
So, here we will see how you can read the JSON data in python and extract the specific data from the file? We will use the ‘json’ python module. You don’t need to install it using the pip because it’s an in-built module. You can just use it by importing it into the file.
Let’s get started to play with json data in python.
Parse JSON Object in Python
In this example, we will parse the simple json object string that we will create in python. So first thing you need to import the ‘json‘ module into the file.
Then create a simple json object string in python and assign it to a variable.
Now we will use the loads() function from ‘json‘ module to load the json data from the variable. We store the json data as a string in python with quotes notation.
And then we will use the dumps() function from the ‘json‘ module to convert the python string to a JSON object. Now it’s ready to print your json object in python. See the following example code.
In the above code, we print the json data and used the indent for indentation. You can also use the sort in print to sorting the result. So when you run the above code you will get the output like below.
Output:
Now if you want to iterate this json data then just simply use the loop to prin each data one by one. I’m going to use for loop to print it.
Output:
python: 1 php: 2 c: 3 vb: 4 perl: 5
Hope you understand the basic of parsing the JSON object in python and print the value from it. Let’s now work with file to extract data it using the ‘json’ python module.
Parse JSON File in Python
In this example, we will learn how to extract data from json file in python. In the above example, we saw the parse simple JSON object and in this example, we will do the same but first, we will create a json file with .json extension.
Let’s create the json_data.json file with the following JSON object OR you can download it from here. And you can also use my JSON formatter tool to minify and beautify json object and download it.
To Load this json file in python, we will first open this file as a read mode using the open() function.
The above code will print your json data from the file. It will store the JSON as python dictionaries, you can check the type of json_load variable using the type(json_load) .
Now you can use it in python and get the data from it which you want to use in the program. You can get the specific index data or you can loop through all data.
Let’s look at how to extract specific data from json file object in python that we have printed above example.
Extract Specific Data from JSON File
As we have store json in the json_data variable, now we will use this variable to get the specific value from the json array.
I will use the key represent to index to get that value from JSON object.
For example, if I want to print all ‘languages‘ from the ‘web‘ JSON object then I will use the following code.
Output:
If you want to get only first language the use the following
Output:
Just use the index of the array to get any languages and I’m sure you know that array index always starts from ‘0’.
JSON Array Loop Through Data
As you see in the above example, we fetched all languages and print them as objects. Now if you want to loop the value and print each language one by one then we will use the for loop to do it.
Output:
1 PHP https://www.php.net/ 2 Python https://www.python.org/ 3 Java https://www.java.com/en/
Hope you understand the tutorial how to extract the data from JSON file in python and how to fetch specific data from JSON array.
If you have questions please let me know in the comment section I would love to help you with that.