I can do this in C, but I haven't come across it in Python.
Say I have a few variables:
variable1 = None
variable2 = None
variable3 = None
variable4 = None
variable5 = None
and I have list of values [1, 2, 3, 4]
how can I assign the values to the variables with a single loop so I get the following result:
variable1 = 1
variable2 = 2
variable3 = 3
variable4 = 4
variable5 = None
While you technically can modify local variables, doing so is very discouraged. Instead, you should store those values in a dictionary instead:
variables = {
variable1: None,
variable2: None,
variable3: None,
variable4: None,
variable5: None
}
values = [1, 2, 3, 4]
for i, value in enumerate(values):
variables['variable' + (i + 1)] = value
But of course, if all those variables differentiate is the number, you can simply use a list as well:
# This will create a list with 5 None values, i.e. variables[0] .. variables[4]
variables = [None] * 5
for i, value in enumerate(values):
variables[i] = value
You should indeed consider using a list instead, but if you are sure about what you are doing, try:
var1, var2, var3, var4, var5 = my_list + [None]*(5-len(my_list))
for x in range(1, 6):
if x == 5:
globals()['variable%s' % x] = "None"
else:
globals()['variable%s' % x] = x
for x in range(1, 6):
print(globals()['variable' + str(x)]) #
Note
The globals() method returns the dictionary of the current global symbol table. A symbol table is a data structure maintained by a compiler which contains all necessary information about the program. These include variable names, methods, classes, etc. There are mainly two kinds of symbol table.
Local symbol table stores all information related to the local scope of the program, and is accessed in Python using locals() method. The local scope could be within a function, within a class, etc. Likewise, a Global symbol table stores all information related to the global scope of the program, and is accessed in Python using globals() method. The global scope contains all functions, variables that are not associated with any class or function.
source: https://www.programiz.com/python-programming/methods/built-in/globals
I would not recommend doing this, but if you really must, you could use globals() to get a dictionary of defined variables and functions, to access and to modify them.
var1 = var2 = var3 = var4 = var5 = None
for i, v in enumerate([1, 2, 3, 4]):
globals()["var%d" % (i+1)] = v
print var1, var2, var3, var4, var5
But, really, you should rather use a list or a dict instead, as suggested in the other answers.
listinstead?